[Merge] lp:~david-soto/mailman/postconf_equivalent into lp:mailman

[David Soto]

David Soto has proposed merging lp:~david-soto/mailman/postconf_equivalent into lp:mailman.

Requested reviews:
  Mailman Coders (mailman-coders)
Related bugs:
  Bug #518517 in GNU Mailman: "Add the equivalent of postconf(1)"
  https://bugs.launchpad.net/mailman/+bug/518517

For more details, see:
https://code.launchpad.net/~david-soto/mailman/postconf_equivalent/+merge/144565

This branch adds a postconf equivalent to the subcommands which displays configuration values as described in #518517. I have included a test class with two methods which ensure that the command displays an error message if invalid sections or keys are passed.
You can call the command by executing "/bin/mailman mailmanconf -s section -k key".
-- 
https://code.launchpad.net/~david-soto/mailman/postconf_equivalent/+merge/144565
Your team Mailman Coders is requested to review the proposed merge of lp:~david-soto/mailman/postconf_equivalent into lp:mailman.
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