hdfs: add ha to Httpfs ha #859
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- "krb_principal" can take a list of principals to create or delete. - "krb_keytab" can take a list of principals to put inside one keytab. - Move "try_kinit" in module_utils to be used by other modules.
The return code of grep was not checked so nothing was check. Use a module to check if keytab is working and reuse the same code used by "krb_keytab". The new check use the new "try_kinit" which supports checking multiple principals inside one keytab.
Spnego keytabs need to be created once per machine. Add support for creating spnego HA keytabs by adding HA addresses (for example a load balancer) inside the spnego keytab.
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Which issue(s) this PR fixes
Fixes #858
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