Quantum was missing depend on lxml.
Quantum was missing depend on lxml.

Change-Id: Ie8d582018f2c5f7972f6d9ab8fcf0f79d00f6a99

wolverineav/networking-bigswitch,openstack/networking-bigswitch,wolverineav/networking-bigswitch,stackforge/networking-bigswitch,stackforge/networking-bigswitch,openstack/networking-bigswitch