Fix Neutron plugin XTRACE handling

The various Neutron plugin files need to have unique variables for the
xtrace state as they are sometimes nested more than two levels deep
and MY_XTRACE is getting stomped.  This gives each of the neutron_plugin
and neutron_thirdparty include files a unique XTRACE state variable.

I don't think this is a problem with any of the other plugin include
files (yet) so this just handles Neutron for now.

Change-Id: I7c272a48e7974edecaff5f431ff7443dd6622588
diff --git a/lib/neutron_plugins/services/firewall b/lib/neutron_plugins/services/firewall
index ab6c324..b5253db 100644
--- a/lib/neutron_plugins/services/firewall
+++ b/lib/neutron_plugins/services/firewall
@@ -2,7 +2,7 @@
 # ---------------------------
 
 # Save trace setting
-MY_XTRACE=$(set +o | grep xtrace)
+FW_XTRACE=$(set +o | grep xtrace)
 set +o xtrace
 
 FWAAS_PLUGIN=neutron.services.firewall.fwaas_plugin.FirewallPlugin
@@ -24,4 +24,4 @@
 }
 
 # Restore xtrace
-$MY_XTRACE
+$FW_XTRACE
diff --git a/lib/neutron_plugins/services/loadbalancer b/lib/neutron_plugins/services/loadbalancer
index 531f52f..78e7738 100644
--- a/lib/neutron_plugins/services/loadbalancer
+++ b/lib/neutron_plugins/services/loadbalancer
@@ -2,7 +2,7 @@
 # ---------------------------
 
 # Save trace setting
-MY_XTRACE=$(set +o | grep xtrace)
+LB_XTRACE=$(set +o | grep xtrace)
 set +o xtrace
 
 
@@ -48,4 +48,4 @@
 }
 
 # Restore xtrace
-$MY_XTRACE
+$LB_XTRACE
diff --git a/lib/neutron_plugins/services/metering b/lib/neutron_plugins/services/metering
index 0e5f75b..51123e2 100644
--- a/lib/neutron_plugins/services/metering
+++ b/lib/neutron_plugins/services/metering
@@ -2,7 +2,7 @@
 # ---------------------------
 
 # Save trace setting
-MY_XTRACE=$(set +o | grep xtrace)
+METER_XTRACE=$(set +o | grep xtrace)
 set +o xtrace
 
 
@@ -27,4 +27,4 @@
 }
 
 # Restore xtrace
-$MY_XTRACE
+$METER_XTRACE
diff --git a/lib/neutron_plugins/services/vpn b/lib/neutron_plugins/services/vpn
index e56d361..d920ba6 100644
--- a/lib/neutron_plugins/services/vpn
+++ b/lib/neutron_plugins/services/vpn
@@ -2,7 +2,7 @@
 # ---------------------------
 
 # Save trace setting
-MY_XTRACE=$(set +o | grep xtrace)
+VPN_XTRACE=$(set +o | grep xtrace)
 set +o xtrace
 
 
@@ -30,4 +30,4 @@
 }
 
 # Restore xtrace
-$MY_XTRACE
+$VPN_XTRACE