Enable oslo.limit to be installed from git repo

oslo.limit isn't currently in the list of libraries that can be
installed from a git repo via LIBS_FROM_GIT.

This adds oslo.limit to enable integrated testing against unmerged
oslo.limit changes.

Change-Id: I26cc567fdf4c84014040ae586bbb029b8de7a236
diff --git a/stackrc b/stackrc
index 3dc800a..e0d71df 100755
--- a/stackrc
+++ b/stackrc
@@ -415,6 +415,10 @@
 GITREPO["oslo.i18n"]=${OSLOI18N_REPO:-${GIT_BASE}/openstack/oslo.i18n.git}
 GITBRANCH["oslo.i18n"]=${OSLOI18N_BRANCH:-$TARGET_BRANCH}
 
+# oslo.limit
+GITREPO["oslo.limit"]=${OSLOLIMIT_REPO:-${GIT_BASE}/openstack/oslo.limit.git}
+GITBRANCH["oslo.limit"]=${OSLOLIMIT_BRANCH:-$TARGET_BRANCH}
+
 # oslo.log
 GITREPO["oslo.log"]=${OSLOLOG_REPO:-${GIT_BASE}/openstack/oslo.log.git}
 GITBRANCH["oslo.log"]=${OSLOLOG_BRANCH:-$TARGET_BRANCH}