Remove redundant dependencies in test-requirements
Remove redundant dependencies in test-requirements

Hacking 0.7 already pins down pep8, pyflakes and flake8 so they can be
removed from test-requirements as they are indirect dependencies.

Co-author: Joe Gordon <joe.gordon0@gmail.com>

Change-Id: Ia9f50e35f292ba35f8ca036cd66c930a3ad46ffd

saeki-masaki/glance,ozamiatin/glance,sigmavirus24/glance,stevelle/glance,vuntz/glance,takeshineshiro/glance,saeki-masaki/glance,klmitch/glance,rajalokan/glance,stevelle/glance,cloudbau/glance,darren-wang/gl,akash1808/glance,tanglei528/glance,paramite/glance,kfwang/Glance-OVA-OVF,scripnichenko/glance,openstack/glance,darren-wang/gl,rajalokan/glance,redhat-openstack/glance,tanglei528/glance,jumpstarter-io/glance,openstack/glance,vuntz/glance,scripnichenko/glance,dims/glance,klmitch/glance,akash1808/glance,dims/glance,kfwang/Glance-OVA-OVF,JioCloud/glance,wkoathp/glance,sigmavirus24/glance,openstack/glance,paramite/glance,JioCloud/glance,wkoathp/glance,cloudbau/glance,takeshineshiro/glance,redhat-openstack/glance,ozamiatin/glance,jumpstarter-io/glance