Remove python-dateutil useless requirement
Remove python-dateutil useless requirement

This patch cleans up the requirement list to remove python-dateutil module
that is not used anymore directly by monasca-api.

Change-Id: I8e7125b979480bf6eb20b10b5e03d349c75f5a6d

openstack/monasca-api,stackforge/monasca-api,openstack/monasca-api,stackforge/monasca-api,stackforge/monasca-api,sapcc/monasca-api,sapcc/monasca-api,sapcc/monasca-api,stackforge/monasca-api,openstack/monasca-api