Add missing requirements

oslo.config and tempest are imported in code [1][2], need
to add them to requirements.txt.

[1] https://github.com/openstack/patrole/blob/master/patrole_tempest_plugin/config.py#L16
[2] https://github.com/openstack/patrole/blob/master/patrole_tempest_plugin/plugin.py#L18

Change-Id: Iff07023c9d9ac9a9435cc09f0a1dbc869a89d527
1 file changed