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/stackrc b/stackrc
index 9cd9c05..f2aafe9 100644
--- a/stackrc
+++ b/stackrc
@@ -327,6 +327,10 @@
 GITREPO["automaton"]=${AUTOMATON_REPO:-${GIT_BASE}/openstack/automaton.git}
 GITBRANCH["automaton"]=${AUTOMATON_BRANCH:-master}
 
+# oslo.cache
+GITREPO["oslo.cache"]=${OSLOCACHE_REPO:-${GIT_BASE}/openstack/oslo.cache.git}
+GITBRANCH["oslo.cache"]=${OSLOCACHE_BRANCH:-master}
+
 # oslo.concurrency
 GITREPO["oslo.concurrency"]=${OSLOCON_REPO:-${GIT_BASE}/openstack/oslo.concurrency.git}
 GITBRANCH["oslo.concurrency"]=${OSLOCON_BRANCH:-master}