[SP-1619] [MONDRIAN-2229] Backport of this case. Makes the FileRepository use the right field for DISCOVER_DATASOURCES.DataSourceInfo. Also adds logic to make sure we don't leak JDBC related infos through the XmlaExtra interface.
Merge pull request #403 from lucboudreau/3.8

[SP-1619] [MONDRIAN-2229] Backport of this case. Makes the FileRepositor...