Temporarily remove rst from gitattributes
Temporarily remove rst from gitattributes

Since the cached version on gate includes rst with crlf, gitattributes
is causing checkout failure and eventually leading to the gate failing.
Temporarily remove rst from gitattributes so we can have our gate back.

Change-Id: I88d82587d2c38f3cfcf6ee710519b2d6a248e830

openstack/smaug,openstack/smaug