Put version.yaml into /etc/fuel/$RELEASE/ dir

During master provisioning create /etc/fuel/5.0 directory, add
version.yaml and make symlink from /etc/fuel/5.0/version.yaml to
/etc/fuel/version.yaml

Change-Id: Ie9080720c60e29e43f3e858f40b25c60a5183423
Closes-Bug: #1317049
Implements: blueprint fuel-containerization-of-services
Merge "Put version.yaml into /etc/fuel/$RELEASE/ dir"