* stable-2.15:
DataSourceProvider: Validate connection
Set version to 2.14.12-SNAPSHOT
Set version to 2.14.11
Upgrade elasticsearch-rest-client to 6.3.2
StalenessChecker: URLDecode project name before checking staleness
AbstractQueryChangesTest: Add a test with project name that requires URL encoding
Upgrade Dropwizard Metrics to 4.0.3
Upgrade JGit to 4.7.2.201807261330-r
Fix typos in documentation of 'List Files' REST API element
Perform fonts preloads in "anonymous" cross-origin mode
Change-Id: I65d53e9a001d2ce7445ccd639d97b5bad084e97c