Add postgres support

postgres schema supplied by Machado

Change-Id: Ibc2457d223fd9b6c53af97671b7f5150c639a08e
Mark getUserDN as it's used from OpenStackManager

Change-Id: Id4e32206db638e602098ef83b2e89e941291faee
Use $wgRedactedFunctionArguments for sensitive data

Change-Id: I21326be80d02e1b5711d4fd2cae2a7c2373277fc
fixes getDomain() for UseLocal = true;

getDomain() didn't return 'local' if there was only one DomainName defined.

Change-Id: I0613c117735c26cbfc7fadc2962db93fc5c1883b
Localisation updates from https://translatewiki.net.

Change-Id: I4b5a59e61361f0a6dc1c159032c7b5d4951e5a1e
Merge branch 'master' of https://github.com/wikimedia/mediawiki-extensions-LdapAuthentication