Add oslo.cache to devstack

as part of the graduation process, add oslo.cache to lib/oslo
and stackrc.

Change-Id: I2baf0384dd5d71d234a95b7acd0bfe5534f2732c
diff --git a/tests/test_libs_from_pypi.sh b/tests/test_libs_from_pypi.sh
index fc65967..1f7169c 100755
--- a/tests/test_libs_from_pypi.sh
+++ b/tests/test_libs_from_pypi.sh
@@ -40,6 +40,7 @@
 ALL_LIBS+=" python-ceilometerclient oslo.utils python-swiftclient"
 ALL_LIBS+=" python-neutronclient tooz ceilometermiddleware oslo.policy"
 ALL_LIBS+=" debtcollector os-brick automaton futurist oslo.service"
+ALL_LIBS+=" oslo.cache"
 
 # Generate the above list with
 # echo ${!GITREPO[@]}