OPENDJ-1620 Unexpected log severity for some actions/commands


AciSyntax.java:
In valueIsAcceptable(), fixed first error by replacing call logger.error() with logger.warn().

Importer.java:
In endWriteTask(), fixed second error by replacing call logger.error() with logger.debug().

ReplicationDomain.java:
In initialize(), fixed third error by replacing call logger.error() with logger.debug().

BindRule.java:
Code cleanup

access_control*.properties:
Renamed ERR_ACI_* to WARN_ACI_* to match what the code was doing in OpenDJ 2.x.