Remove HTTP File Upload 0.2.5 support

[fenek]

This PR removes support for the outdated 0.2.5 specification of HTTP File Upload.

• Module updated
• Tests updated
• Docs updated (module & migration guide)

[mongoose-im]

8940.1 / Erlang 23.0.3 / small_tests / 45faab7
Reports root / small

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8940.2 / Erlang 23.0.3 / internal_mnesia / 45faab7
Reports root/ big
OK: 1495 / Failed: 0 / User-skipped: 168 / Auto-skipped: 0

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8940.4 / Erlang 23.0.3 / mysql_redis / 45faab7
Reports root/ big
OK: 2766 / Failed: 0 / User-skipped: 233 / Auto-skipped: 0

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8940.3 / Erlang 23.0.3 / odbc_mssql_mnesia / 45faab7
Reports root/ big
OK: 2771 / Failed: 0 / User-skipped: 228 / Auto-skipped: 0

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8940.7 / Erlang 23.0.3 / elasticsearch_and_cassandra_mnesia / 45faab7
Reports root/ big
OK: 330 / Failed: 0 / User-skipped: 38 / Auto-skipped: 0

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8940.6 / Erlang 23.0.3 / ldap_mnesia / 45faab7
Reports root/ big
OK: 1405 / Failed: 0 / User-skipped: 258 / Auto-skipped: 0

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8940.5 / Erlang 23.0.3 / riak_mnesia / 45faab7
Reports root/ big
OK: 1629 / Failed: 0 / User-skipped: 180 / Auto-skipped: 0

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8940.9 / Erlang 22.3 / pgsql_mnesia / 45faab7
Reports root/ big / small
OK: 2784 / Failed: 0 / User-skipped: 215 / Auto-skipped: 0

[codecov]

Codecov Report

Merging #2989 (726e11e) into master (24f4236) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2989      +/-   ##
==========================================
- Coverage   79.17%   79.13%   -0.05%     
==========================================
  Files         377      377              
  Lines       32846    32840       -6     
==========================================
- Hits        26005    25987      -18     
- Misses       6841     6853      +12     

Impacted Files	Coverage Δ
src/http_upload/mod_http_upload.erl	90.36% <100.00%> (-0.65%)	⬇️
src/mongoose_tcp_listener.erl	76.59% <0.00%> (-4.26%)	⬇️
src/ejabberd_s2s_out.erl	58.35% <0.00%> (-1.38%)	⬇️
src/pubsub/mod_pubsub.erl	71.87% <0.00%> (-0.30%)	⬇️
src/mod_muc_room.erl	77.37% <0.00%> (-0.18%)	⬇️
src/mod_muc_log.erl	77.55% <0.00%> (+0.25%)	⬆️
src/global_distrib/mod_global_distrib_utils.erl	66.03% <0.00%> (+0.94%)	⬆️
src/ejabberd_local.erl	73.13% <0.00%> (+1.49%)	⬆️

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[leszke]

Looks good, I left one minor comment only