Set default branch to stable/havana

Change-Id: I7a0401d42b938969e325e54e008feb8224e4a79b
Require python-cinderclient>=1.0.6

Havana Nova uses cinderclient 1.0.6 APIs to support volume
migration (migrate_volume_completion).

(cherry picked from commit 1a0f89ffa75150a8383c75c05f3b4ec5b12a4b50)
Conflicts:
	global-requirements.txt

Partial-Bug: #1230925
Change-Id: I5980fb67d99dd49920244513ddd0f282194799a9
Merge "Set default branch to stable/havana" into stable/havana
Merge "Require python-cinderclient>=1.0.6" into stable/havana