The requirements.txt file isn't correct

We now depend on jinja2 and docker-py for building images.

We no longer depend on docker-compose for any part of our
runtime so removing it as a requirement.  If we keep compose
in the tree, it will be for reference only, not for runtime.

Change-Id: Ie663a0f183e74c14f01e9cb4fdc8763355c6415a
Partially-Implements: blueprint dockerfile-template

requirements.txt

-docker-compose==1.3.0
+docker-py>=1.1.0  # Apache-2.0
+Jinja2>=2.6  # BSD License (3 clause)

test-requirements.txt

@@ -14,4 +14,3 @@ python-swiftclient>=2.2.0
 testrepository>=0.0.18
 testscenarios>=0.4
 testtools>=0.9.36,!=1.2.0
-jinja2