Add python-barbicanclient to LIBS_FROM_GIT

Allow python-barbicanclient to be installed from git instead of pip.

Change-Id: I99cd72724e11bab362bcaaeb773f33b2abfe815c
diff --git a/lib/libraries b/lib/libraries
index 761ce66..4ceb804 100644
--- a/lib/libraries
+++ b/lib/libraries
@@ -121,6 +121,9 @@
     # os-traits for nova
     _install_lib_from_source "os-brick"
     _install_lib_from_source "os-traits"
+    #
+    # python client libraries we might need from git can go here
+    _install_lib_from_source "python-barbicanclient"
 
 
     # etcd (because tooz does not have a hard dependency on these)