Infer rootwrap arguments from project

We can infer the binary and configuration paths just from the project
name and expanding this to the known *_DIR & *_BIN_DIR variables.  A
similar thing is done for policyd settings

Change-Id: I7c6a9fa106948ae5cbcf52555ade6154623798f1
diff --git a/lib/ceilometer b/lib/ceilometer
index 9abdbfe..1f72187 100644
--- a/lib/ceilometer
+++ b/lib/ceilometer
@@ -254,7 +254,7 @@
 
     if is_service_enabled ceilometer-aipmi; then
         # Configure rootwrap for the ipmi agent
-        configure_rootwrap ceilometer $CEILOMETER_BIN_DIR/ceilometer-rootwrap $CEILOMETER_DIR/etc/ceilometer
+        configure_rootwrap ceilometer
     fi
 }