Add .gitreview file for new repository

git-review tool is a de-facto standard for working with OpenStack
and Stackforge projects via Gerrit change requests. .gitreview file
sets default configuration parameters for git-review utility,
including remote name, host, port and default branch.

Change-Id: I2275c9ac888ddb0b51ec2dc0f4d2515d152e79c1
Merge "Add .gitreview file for new repository"