Enable neutron-lib for LIBS_FROM_GIT for backwards compat jobs

Change-Id: I8dd84c59d2ec3a7c01ff4f1aaf7fa61d7466cfd5
diff --git a/lib/neutron-legacy b/lib/neutron-legacy
index 73a1bcd..bd876e2 100644
--- a/lib/neutron-legacy
+++ b/lib/neutron-legacy
@@ -623,6 +623,13 @@
 
 # install_neutron() - Collect source and prepare
 function install_neutron {
+    # Install neutron-lib from git so we make sure we're testing
+    # the latest code.
+    if use_library_from_git "neutron-lib"; then
+        git_clone_by_name "neutron-lib"
+        setup_dev_lib "neutron-lib"
+    fi
+
     git_clone $NEUTRON_REPO $NEUTRON_DIR $NEUTRON_BRANCH
     setup_develop $NEUTRON_DIR
     if is_service_enabled q-fwaas; then