Use stevedore aliases for interface_driver configuration

interface_driver configuration was updated to use stevedore aliases.
This patch is to change devstack scripts to now use the aliases
instead of the previous class imports.

Closes-Bug: #1504536

Change-Id: Ic56bfcc1f9da05a999e6fd328e4dd6617e9470ff
diff --git a/lib/neutron_plugins/bigswitch_floodlight b/lib/neutron_plugins/bigswitch_floodlight
index 4166131..f52105e 100644
--- a/lib/neutron_plugins/bigswitch_floodlight
+++ b/lib/neutron_plugins/bigswitch_floodlight
@@ -58,9 +58,9 @@
 function neutron_plugin_setup_interface_driver {
     local conf_file=$1
     if [ "$BS_FL_VIF_DRIVER" = "ivs" ]; then
-        iniset $conf_file DEFAULT interface_driver neutron.agent.linux.interface.IVSInterfaceDriver
+        iniset $conf_file DEFAULT interface_driver ivs
     else
-        iniset $conf_file DEFAULT interface_driver neutron.agent.linux.interface.OVSInterfaceDriver
+        iniset $conf_file DEFAULT interface_driver openvswitch
     fi
 }
 
diff --git a/lib/neutron_plugins/brocade b/lib/neutron_plugins/brocade
index 557b94d..953360e 100644
--- a/lib/neutron_plugins/brocade
+++ b/lib/neutron_plugins/brocade
@@ -68,7 +68,7 @@
 
 function neutron_plugin_setup_interface_driver {
     local conf_file=$1
-    iniset $conf_file DEFAULT interface_driver neutron.agent.linux.interface.BridgeInterfaceDriver
+    iniset $conf_file DEFAULT interface_driver linuxbridge
 }
 
 function has_neutron_plugin_security_group {
diff --git a/lib/neutron_plugins/cisco b/lib/neutron_plugins/cisco
index 90dcd57..7d0cf1a 100644
--- a/lib/neutron_plugins/cisco
+++ b/lib/neutron_plugins/cisco
@@ -150,7 +150,7 @@
 
 function neutron_plugin_setup_interface_driver {
     local conf_file=$1
-    iniset $conf_file DEFAULT interface_driver neutron.agent.linux.interface.OVSInterfaceDriver
+    iniset $conf_file DEFAULT interface_driver openvswitch
 }
 
 # Restore xtrace
diff --git a/lib/neutron_plugins/linuxbridge_agent b/lib/neutron_plugins/linuxbridge_agent
index bd4438d..f28bcfe 100644
--- a/lib/neutron_plugins/linuxbridge_agent
+++ b/lib/neutron_plugins/linuxbridge_agent
@@ -85,7 +85,7 @@
 
 function neutron_plugin_setup_interface_driver {
     local conf_file=$1
-    iniset $conf_file DEFAULT interface_driver neutron.agent.linux.interface.BridgeInterfaceDriver
+    iniset $conf_file DEFAULT interface_driver linuxbridge
 }
 
 function neutron_plugin_check_adv_test_requirements {
diff --git a/lib/neutron_plugins/openvswitch_agent b/lib/neutron_plugins/openvswitch_agent
index 48e47b3..5a843ff 100644
--- a/lib/neutron_plugins/openvswitch_agent
+++ b/lib/neutron_plugins/openvswitch_agent
@@ -110,7 +110,7 @@
 
 function neutron_plugin_setup_interface_driver {
     local conf_file=$1
-    iniset $conf_file DEFAULT interface_driver neutron.agent.linux.interface.OVSInterfaceDriver
+    iniset $conf_file DEFAULT interface_driver openvswitch
 }
 
 function neutron_plugin_check_adv_test_requirements {