Allow configuration of DB drivers on docker install

Added the ability to supply 'pubsub_driver' and 'nb_db_driver'
parameters to the docker deployment.
This allows installation with databases different than etcd.
The default driver is still the etcd one, to maintain backward
compatibility.

Related-Bug: #1778007
Change-Id: Ibbd3b0fc4116dd5ac6514730773f771c0b27e5f7

etc/standalone/dragonflow.ini

@@ -2,7 +2,7 @@
 
 
 [df]
-pub_sub_driver = etcd_pubsub_driver
+pub_sub_driver = PUBSUB_DRIVER
 enable_selective_topology_distribution = False
 enable_df_pub_sub = True
 apps_list = portbinding,l2,l3_proactive,dhcp,dnat,sg,portqos,classifier,tunneling,provider,metadata_service,active_port_detection,migration
@@ -13,7 +13,7 @@ management_ip = MANAGEMENT_IP
 enable_dpdk = False
 enable_neutron_notifier = False
 remote_db_hosts = DB_SERVER_IP
-nb_db_class = etcd_nb_db_driver
+nb_db_class = NB_DB_DRIVER
 auto_detect_port_behind_port = False
 publisher_rate_limit_count = 1
 publisher_rate_limit_timeout = 180

tools/run_dragonflow.sh

@@ -18,6 +18,14 @@ while test ${#} -gt 0; do
     --db_init)
       DB_INIT=1
       ;;
+    --nb_db_driver)
+      shift
+      NB_DB_DRIVER=$1
+      ;;
+    --pubsub_driver)
+      shift
+      PUBSUB_DRIVER=$1
+      ;;
     --)
       shift
       break
@@ -30,14 +38,20 @@ while test ${#} -gt 0; do
   shift
 done
 
-# SET DRAGONFLOW_IP and DB_IP on the ini file
+# Use defaults if not supplied
+NB_DB_DRIVER=${NB_DB_DRIVER:-etcd_nb_db_driver}
+PUBSUB_DRIVER=${PUBSUB_DRIVER:-etcd_pubsub_driver}
+
 if [ ! -d /etc/dragonflow ]; then
   mkdir -p /etc/dragonflow
 fi
+# Set parameters to the ini file
 if [ ! -e /etc/dragonflow/dragonflow.ini ]; then
   sed -e "s/LOCAL_IP/$DRAGONFLOW_IP/g" etc/standalone/dragonflow.ini | \
     sed -e "s/MANAGEMENT_IP/$MANAGEMENT_IP/g" | \
-    sed -e "s/DB_SERVER_IP/$DB_IP/g"  > /etc/dragonflow/dragonflow.ini
+    sed -e "s/DB_SERVER_IP/$DB_IP/g" | \
+    sed -e "s/NB_DB_DRIVER/$NB_DB_DRIVER/g" | \
+    sed -e "s/PUBSUB_DRIVER/$PUBSUB_DRIVER/g"  > /etc/dragonflow/dragonflow.ini
 fi
 if [ ! -e /etc/dragonflow/dragonflow_datapath_layout.yaml ]; then
   cp etc/dragonflow_datapath_layout.yaml /etc/dragonflow