Align requirements with global-requirements.txt
Align requirements with global-requirements.txt

All requirements but pyzmq (which needs further debugging) are in line with global-requirements (if they
are there). Also, pinning to specific versions was removed.

Change-Id: Ic08b5fabad765abc09d8494ddc22a2a9fe1e50d7
Related-bug: 1546497

openstack/solar,openstack/solar,openstack/solar