reqs: fallback to vendored python-etcd

We need to figure out why this is a problem, but it can't block our
deployment for now.

requirements-nover.txt

@@ -39,6 +39,7 @@ git+https://github.com/coreos/peewee.git
 git+https://github.com/coreos/py-bitbucket.git
 git+https://github.com/coreos/pyapi-gitlab.git
 git+https://github.com/coreos/mockldap.git
+git+https://github.com/DevTable/python-etcd.git@sslfix
 gipc
 pyOpenSSL
 pygpgme
@@ -50,4 +51,3 @@ python-swiftclient
 python-keystoneclient
 Flask-Testing
 pyjwt
-python-etcd