Description
Backport AzureDataStore to 1.6.
Relevant changes in trunk (1.8):
1. https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1788387
2. https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1788388
3. https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1788389