Remove unused requirements
Remove unused requirements

These packages are not imported in monascaclient, remove them
from requirements.txt to avoid installing.

Change-Id: I239124ca1dcda943f7d1ea2aec881b83576f81a7

stackforge/python-monascaclient,openstack/python-monascaclient,sapcc/python-monascaclient,sapcc/python-monascaclient,stackforge/python-monascaclient,openstack/python-monascaclient