Fix the check for already loaded backend modules

[chrzaszcz]

Fix the expected backend module name to correctly recognize if the module has already been loaded.

[codecov]

Codecov Report

Merging #1438 into master will increase coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1438      +/-   ##
==========================================
+ Coverage   76.91%   76.99%   +0.07%     
==========================================
  Files         323      323              
  Lines       28116    28226     +110     
==========================================
+ Hits        21626    21732     +106     
- Misses       6490     6494       +4

Impacted Files	Coverage Δ
src/backend_module.erl	96.87% <100%> (+3.54%)	⬆️
src/inbox/mod_inbox.erl	94.7% <100%> (ø)	⬆️
src/muc_light/mod_muc_light_utils.erl	83.33% <0%> (-4.06%)	⬇️
src/mam/mod_mam_rdbms_prefs.erl	92.52% <0%> (-3.74%)	⬇️
src/rdbms/mongoose_rdbms.erl	67.21% <0%> (-2.74%)	⬇️
...bal_distrib/mod_global_distrib_hosts_refresher.erl	82.22% <0%> (-2.23%)	⬇️
src/mam/mod_mam_utils.erl	82.37% <0%> (-0.68%)	⬇️
src/mod_muc_log.erl	77.69% <0%> (ø)	⬆️
src/gen_mod.erl	75.53% <0%> (ø)	⬆️
src/auth/ejabberd_auth_external.erl	32.07% <0%> (ø)	⬆️
... and 8 more

---

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[mongoose-im]

5817.1 / Erlang 19.3 / small_tests / ccc2356
Reports root / small

---

5817.5 / Erlang 19.3 / ldap_mnesia / ccc2356
Reports root/ big
OK: 1060 / Failed: 3 / User-skipped: 88 / Auto-skipped: 21

vcard_simple_SUITE:all:retrieve_own_card

{error,{test_case_failed,"Expected <<\"alice\">> got undefined\n"}}

Report log

vcard_simple_SUITE:all:retrieve_own_card

{error,{test_case_failed,"Expected <<\"alice\">> got undefined\n"}}

Report log

vcard_simple_SUITE:all:retrieve_own_card

{error,{test_case_failed,"Expected <<\"alice\">> got undefined\n"}}

Report log

---

5817.3 / Erlang 19.3 / mysql_redis / ccc2356
Reports root/ big
OK: 2874 / Failed: 0 / User-skipped: 222 / Auto-skipped: 0

---

5817.2 / Erlang 19.3 / internal_mnesia / ccc2356
Reports root/ big
OK: 1129 / Failed: 2 / User-skipped: 51 / Auto-skipped: 0

mod_global_distrib_SUITE:mod_global_distrib:test_pm_with_ungraceful_reconnection_to_different_server

{error,
  {timeout_when_waiting_for_stanza,
    [{escalus_client,wait_for_stanza,
       [{client,<<"eve82.588239@localhost/res1">>,escalus_tcp,
          <0.12938.1>,
          [{event_manager,<0.12929.1>},
           {server,<<"localhost">>},
           {username,<<"eve82.588239">>},
           {resource,<<"res1">>}],
          [{event_client,
             [{event_manager,<0.12929.1>},
            {server,<<"localhost">>},
            {username,<<"eve82.588239">>},
            {resource,<<"res1">>}]},
           {resource,<<"res1">>},
           {username,<<"eve82.588239">>},
           {server,<<"localhost">>},
           {host,<<"localhost">>},
           {port,5222},
           {auth,{escalus_auth,auth_plain}},
           {wspath,undefined},
           {username,<<"eve82.588239">>},
           {server,<<"localhost">>},
           {password,<<"password">>},
           {port,5222},
           {stream_management,true},
           {stream_id,<<"775736CC26DB3C0C">>}]},
        10000],
       [{file,
          "/home/travis/build/esl/MongooseIM/big_tests/_build/default/lib/escalus/src/escalus_client.erl"},
        {line,138}]},
     {mod_global_distrib_SUITE,
       '-test_pm_with_ungraceful_reconnection_to_different_server/1-fun-0-',
       4,
       [{file,"mod_global_distrib_SUITE.erl"},{line,607}]},
     {escalus_story,story,4,
       [{file,
          "/home/travis/build/esl/MongooseIM/big_tests/_build/default/lib/escalus/src/escalus_story.erl"},
        {line,72}]},
    ...

Report log

mod_global_distrib_SUITE:mod_global_distrib:test_pm_with_ungraceful_reconnection_to_different_server

{error,
  {timeout_when_waiting_for_stanza,
    [{escalus_client,wait_for_stanza,
       [{client,<<"eve22.828593@localhost/res1">>,escalus_tcp,
          <0.13560.1>,
          [{event_manager,<0.13551.1>},
           {server,<<"localhost">>},
           {username,<<"eve22.828593">>},
           {resource,<<"res1">>}],
          [{event_client,
             [{event_manager,<0.13551.1>},
            {server,<<"localhost">>},
            {username,<<"eve22.828593">>},
            {resource,<<"res1">>}]},
           {resource,<<"res1">>},
           {username,<<"eve22.828593">>},
           {server,<<"localhost">>},
           {host,<<"localhost">>},
           {port,5222},
           {auth,{escalus_auth,auth_plain}},
           {wspath,undefined},
           {username,<<"eve22.828593">>},
           {server,<<"localhost">>},
           {password,<<"password">>},
           {port,5222},
           {stream_management,true},
           {stream_id,<<"BCD5E1DAAAC579C6">>}]},
        10000],
       [{file,
          "/home/travis/build/esl/MongooseIM/big_tests/_build/default/lib/escalus/src/escalus_client.erl"},
        {line,138}]},
     {mod_global_distrib_SUITE,
       '-test_pm_with_ungraceful_reconnection_to_different_server/1-fun-0-',
       4,
       [{file,"mod_global_distrib_SUITE.erl"},{line,607}]},
     {escalus_story,story,4,
       [{file,
          "/home/travis/build/esl/MongooseIM/big_tests/_build/default/lib/escalus/src/escalus_story.erl"},
        {line,72}]},
    ...

Report log

---

5817.6 / Erlang 19.3 / elasticsearch_and_cassandra_mnesia / ccc2356
Reports root/ big
OK: 445 / Failed: 0 / User-skipped: 8 / Auto-skipped: 0

---

5817.4 / Erlang 19.3 / odbc_mssql_mnesia / ccc2356
Reports root/ big
OK: 2888 / Failed: 0 / User-skipped: 208 / Auto-skipped: 0

---

5817.8 / Erlang 20.0 / pgsql_mnesia / ccc2356
Reports root/ big / small
OK: 2920 / Failed: 0 / User-skipped: 176 / Auto-skipped: 0

---

5817.9 / Erlang 21.0 / riak_mnesia / ccc2356
Reports root/ big / small
OK: 1326 / Failed: 0 / User-skipped: 49 / Auto-skipped: 0

---

5817.2 / Erlang 19.3 / internal_mnesia / ccc2356
Reports root/ big
OK: 1103 / Failed: 0 / User-skipped: 51 / Auto-skipped: 0

---

5817.5 / Erlang 19.3 / ldap_mnesia / ccc2356
Reports root/ big
OK: 1068 / Failed: 0 / User-skipped: 86 / Auto-skipped: 0