Install tempest-lib as part of install_tempest

This commit adds support to devstack to install the newly created
tempest-lib project.

Change-Id: Ifcf56639757ec4814dcd31f791931afe61f5a672
diff --git a/lib/tempest b/lib/tempest
index 0c79304..906cb00 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -48,6 +48,7 @@
 TEMPEST_CONFIG_DIR=${TEMPEST_CONFIG_DIR:-$TEMPEST_DIR/etc}
 TEMPEST_CONFIG=$TEMPEST_CONFIG_DIR/tempest.conf
 TEMPEST_STATE_PATH=${TEMPEST_STATE_PATH:=$DATA_DIR/tempest}
+TEMPEST_LIB_DIR=$DEST/tempest-lib
 
 NOVA_SOURCE_DIR=$DEST/nova
 
@@ -428,8 +429,15 @@
     fi
 }
 
+# install_tempest_lib() - Collect source, prepare, and install tempest-lib
+function install_tempest_lib {
+    git_clone $TEMPEST_LIB_REPO $TEMPEST_LIB_DIR $TEMPEST_LIB_BRANCH
+    setup_develop $TEMPEST_LIB_DIR
+}
+
 # install_tempest() - Collect source and prepare
 function install_tempest {
+    install_tempest_lib
     git_clone $TEMPEST_REPO $TEMPEST_DIR $TEMPEST_BRANCH
     pip_install tox
 }