Revert "Add Pillow to test-requirements.txt"
Revert "Add Pillow to test-requirements.txt"

This reverts commit 47b401f9eb2a129eec11bf0f5428e00869e8ca57.

Adding Pillow to *requirements.txt was a temporary way to set the
upper bound to < 3.0.0

nodepool thick slaves and requirements have been fixed and devstack is
fixed in the patch that this depends on.

Conflicts:
	test-requirements.txt

Change-Id: I3fc4009680ace3ba9c222aa7ad8c8ff7d6794f94
Depends-On: I2bec8cf1bfeaaa6ae329704229fdeb86d26e55c7

openstack/api-site,openstack/api-site,dreamhost/api-site,openstack/api-site,dreamhost/api-site,Tesora/tesora-api-site,dreamhost/api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,dreamhost/api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,dreamhost/api-site,dreamhost/api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,openstack/api-site,dreamhost/api-site