Allow to install os-resource-classes from git repo

Example local.conf config snippet:

LIBS_FROM_GIT="os-resource-classes"
OS_RESOURCE_CLASSES_REPO="${LOCAL_GIT_BASE}/os-resource-classes"
OS_RESOURCE_CLASSES_BRANCH="dev_branch"

Closes-Bug: #1934784
Change-Id: I972a2a49aa816433152e5cfac4f672c0465d083f
diff --git a/lib/libraries b/lib/libraries
old mode 100644
new mode 100755
index c7aa815..67ff21f
--- a/lib/libraries
+++ b/lib/libraries
@@ -59,6 +59,7 @@
 # Non oslo libraries are welcomed below as well, this prevents
 # duplication of this code.
 GITDIR["os-brick"]=$DEST/os-brick
+GITDIR["os-resource-classes"]=$DEST/os-resource-classes
 GITDIR["os-traits"]=$DEST/os-traits
 
 # Support entry points installation of console scripts
@@ -122,6 +123,7 @@
     #
     # os-traits for nova
     _install_lib_from_source "os-brick"
+    _install_lib_from_source "os-resource-classes"
     _install_lib_from_source "os-traits"
     #
     # python client libraries we might need from git can go here