Exclude openstack-common from pep8 test
Exclude openstack-common from pep8 test

Fixes bug #1048962

Added "openstack" to PEP8_EXCLUDE in run_tests.sh

Change-Id: I5919c97681b1f037e231df7ddb449c2a16366128

gkotton/vmware-nsx,gkotton/vmware-nsx