Prevent stable branches to use glancelcient 0.14.0

This version contains a bug introduced that prevents using that specific
version of the client with older openstack deployments. The fix is:
I8c871f11b909337bd7df19b77e606772dbc634b2 and was released in 0.14.1

Change-Id: I46b01da2f2fee805281513434099e4c5ebbee8f9

global-requirements.txt

@@ -86,7 +86,7 @@ python-ceilometerclient>=1.0.6
 python-cinderclient>=1.0.6
 python-designateclient>=1.0.0
 python-heatclient>=0.2.3
-python-glanceclient>=0.9.0
+python-glanceclient>=0.9.0,!=0.14.0
 python-ironicclient
 python-keystoneclient>=0.7.0
 python-memcached>=1.48