add lib/stackforge to let us test wsme / pecan from git

wsme and pecan libraries have migrated to stackforge for
development. If we support them in devstack, we can use their git
version instead of the release version, which ensures that they
won't break the rest of OpenStack when they cut a new release.

This is similar to how oslo testing works. Long term we probably
want a more generic mechanism to handle this, but for now, this
should get us rolling, and get them gating.

Change-Id: Icf3475f433081c7c625864107d7e118e214396e1
diff --git a/stack.sh b/stack.sh
index aa0efea..df5cd4c 100755
--- a/stack.sh
+++ b/stack.sh
@@ -299,6 +299,7 @@
 source $TOP_DIR/lib/tls
 source $TOP_DIR/lib/infra
 source $TOP_DIR/lib/oslo
+source $TOP_DIR/lib/stackforge
 source $TOP_DIR/lib/horizon
 source $TOP_DIR/lib/keystone
 source $TOP_DIR/lib/glance
@@ -627,6 +628,9 @@
 # Install oslo libraries that have graduated
 install_oslo
 
+# Install stackforge libraries for testing
+install_stackforge
+
 # Install clients libraries
 install_keystoneclient
 install_glanceclient