Launch functional tests serially
Launch functional tests serially

Currently, functional tests are not isolated and each test has access to
resources from parallel launched tests.
This patch is a hack to isolate tests and give ability to create as many
resources as tenant quotas allow.

Change-Id: Idc0a60d350e408bdbd67a7a527698be9f4d6b27b

mat128/python-novaclient,takeshineshiro/python-novaclient,mat128/python-novaclient,takeshineshiro/python-novaclient