Add missing requirements
Add missing requirements

keystoneauth1 is imported in senlinclient but not added into requirements [1].
This patch fixes that.

[1] https://github.com/openstack/python-senlinclient/blob/master/senlinclient/common/exc.py#L13-L14

Change-Id: I054cd7bea3a61b8d72379e00e8d7d2a11bef75e9

stackforge/python-senlinclient,stackforge/python-senlinclient,openstack/python-senlinclient,openstack/python-senlinclient