Apply service name conventions for Block Storage

There are several instances of "Block Storage Service" in the
upstream documentation. As was recently clarified in the docs
mailing list, these should be "Block Storage service". This patch
applies the fix.

Change-Id: I591c100ab031b75f1c0d27d45f53e32401a26e30
Partial-Bug: #1217503
Apply service name conventions for Image Service

There are several instances of "Image service" in the upstream
documentation. As was recently clarified in the docs mailing list,
these should be "Image Service". This patch applies the fix.

Change-Id: Iefb63673162ae97b2c0fe1c3ff3fb1ac05e95d83
Partial-Bug: #1217503
Add documentation for EMC VNX Direct Driver.

This patch addes documentation for EMC VNX Direct Driver.

Closes-Bug: #1296201

Change-Id: I832585fa139c4d98b0a72c24881869ad7cd9eab3
Merge "Apply service name conventions for Block Storage"
Merge "Apply service name conventions for Image Service"
Merge "Add documentation for EMC VNX Direct Driver."