Remove install unnecessary packages
Remove install unnecessary packages

The docs and releasenotes requirements migrated to doc/requirements.txt
we need not install things from requirements.txt.

Change-Id: I207be0b861c13bc6cf954b2247bb00546990bbf0

mahak/neutron,mahak/neutron,openstack/neutron,openstack/neutron,openstack/neutron,mahak/neutron