[CLEANUP]  Checkstyle.
[BISERVER-10816] Analysis datasource accessible via XMLA even when EnableXmla=false

The check for whether EnableXmla was set to false had a fixed string comparison, which used a different case and quote expectation than what was coming through.
Modified to allow single, double, or no quotes, and case insensitive.
Merge pull request #1270 from mkambol/BISERVER-10816

 [BISERVER-10816] Analysis datasource accessible via XMLA even when EnableXmla=false