Allow installing keystoneauth from git

Keystoneauth is not marked as stable yet however to ensure that the
integration between it, keystoneclient and other services don't break
compatibility we want to test it with tempest.

Unfortunately you can't put -e links in requirements.txt files so add
it to devstack so we can set the test environment. This will also make
it available when keystoneauth is released.

Change-Id: I43ca1df9c6ae2f0ac1a687c9ce1e2ccb97e81652
diff --git a/tests/test_libs_from_pypi.sh b/tests/test_libs_from_pypi.sh
index 8dc3ba3..d10cd0e 100755
--- a/tests/test_libs_from_pypi.sh
+++ b/tests/test_libs_from_pypi.sh
@@ -41,6 +41,7 @@
 ALL_LIBS+=" python-neutronclient tooz ceilometermiddleware oslo.policy"
 ALL_LIBS+=" debtcollector os-brick automaton futurist oslo.service"
 ALL_LIBS+=" oslo.cache oslo.reports"
+ALL_LIBS+=" keystoneauth"
 
 # Generate the above list with
 # echo ${!GITREPO[@]}