Add new oslo.privsep library to oslo repos

A new project olos.privsep has been created but failes sdvm testing as
even though the library is added ro PROJECTS and LIBS_FROM_GIT it isn't
installed by devstack.

Add oslo.privsep to the install_oslo function

Change-Id: Ia4d56747d56dcfe50889ebbdf9d553df13e1b950
diff --git a/lib/oslo b/lib/oslo
index f64f327..56615fa 100644
--- a/lib/oslo
+++ b/lib/oslo
@@ -36,6 +36,7 @@
 GITDIR["oslo.messaging"]=$DEST/oslo.messaging
 GITDIR["oslo.middleware"]=$DEST/oslo.middleware
 GITDIR["oslo.policy"]=$DEST/oslo.policy
+GITDIR["oslo.privsep"]=$DEST/oslo.privsep
 GITDIR["oslo.reports"]=$DEST/oslo.reports
 GITDIR["oslo.rootwrap"]=$DEST/oslo.rootwrap
 GITDIR["oslo.serialization"]=$DEST/oslo.serialization
@@ -79,6 +80,7 @@
     _do_install_oslo_lib "oslo.messaging"
     _do_install_oslo_lib "oslo.middleware"
     _do_install_oslo_lib "oslo.policy"
+    _do_install_oslo_lib "oslo.privsep"
     _do_install_oslo_lib "oslo.reports"
     _do_install_oslo_lib "oslo.rootwrap"
     _do_install_oslo_lib "oslo.serialization"