Parameterized configuration variables for PLUMgrid plugin

Fixes bug 1171028

Change-Id: Ie60ef8903001913996e265917c449bdce1e5aae9
diff --git a/lib/quantum_plugins/plumgrid b/lib/quantum_plugins/plumgrid
index b49aa92..912aa7e 100644
--- a/lib/quantum_plugins/plumgrid
+++ b/lib/quantum_plugins/plumgrid
@@ -25,8 +25,10 @@
 }
 
 function quantum_plugin_configure_service() {
-    iniset /$Q_PLUGIN_CONF_FILE PLUMgridNOS nos_server localhost
-    iniset /$Q_PLUGIN_CONF_FILE PLUMgridNOS nos_server_port 7766
+    PLUMGRID_NOS_IP=${PLUMGRID_NOS_IP:-localhost}
+    PLUMGRID_NOS_PORT=${PLUMGRID_NOS_PORT:-7766}
+    iniset /$Q_PLUGIN_CONF_FILE PLUMgridNOS nos_server $PLUMGRID_NOS_IP
+    iniset /$Q_PLUGIN_CONF_FILE PLUMgridNOS nos_server_port $PLUMGRID_NOS_PORT
 }
 
 function quantum_plugin_configure_debug_command() {