Allow Zanata to start even if Lucene lock files are found

As of 4.4, Hibernate Search's NativeFSLockFactory should be able to
   deal with dead lock files.
Output a warning if indexes are stored in NFS.
Fix some broken tests for Wildfly

Also simplify some of the error stuff, as it was causing problems
Merge pull request #562 from zanata/skipLockCheckUnlessNFS

Allow Zanata to start even if Lucene lock files are found
Merge pull request #605 from zanata/fix-the-wildfly-tests-again

Fix some broken tests for Wildfly