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
diff --git a/requirements.txt b/requirements.txt
index b22bec8..2506f82 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,5 @@
 pbr>=1.8 # Apache-2.0
 urllib3>=1.15.1 # MIT
 oslo.log>=3.11.0 # Apache-2.0
+oslo.config>=3.22.0  # Apache-2.0
+tempest>=14.0.0  # Apache-2.0