Don't run requirements pep8/py27 on Folsom/Grizzly
Don't run requirements pep8/py27 on Folsom/Grizzly

The tox.ini and test files were not backported to the
openstack/requirements stable branches (Folsom and Grizzly). Disable the
two tests that depend on those files so that changes can be merged to
the stable branches.

Change-Id: I92be6f28687385ad12e49fa3f666b049742dc354

osrg/project-config,openstack-infra/project-config,Tesora/tesora-project-config,anbangr/osci-project-config,noorul/os-project-config,citrix-openstack/project-config,anbangr/osci-project-config,coolsvap/project-config,Tesora/tesora-project-config,osrg/project-config,coolsvap/project-config,openstack-infra/project-config,open-switch/infra_project-config,citrix-openstack/project-config,dongwenjuan/project-config,dongwenjuan/project-config,noorul/os-project-config,open-switch/infra_project-config