Fix is_neutron_legacy_enabled function

This function will now first filter out all "neutron-" strings from
DISABLED_SERVICES list before looking for "neutron" string in it.

Change-Id: I5cab6a3be553713e1257599fb72042c6001f2672
Close-Bug: #1824884
diff --git a/lib/neutron b/lib/neutron
index 1066d8e..947c491 100644
--- a/lib/neutron
+++ b/lib/neutron
@@ -117,7 +117,9 @@
 # Test if any Neutron services are enabled
 # is_neutron_enabled
 function is_neutron_legacy_enabled {
-    [[ ,${DISABLED_SERVICES} =~ ,"neutron" ]] && return 1
+    # first we need to remove all "neutron-" from DISABLED_SERVICES list
+    disabled_services_copy=$(echo $DISABLED_SERVICES | sed 's/neutron-//g')
+    [[ ,${disabled_services_copy} =~ ,"neutron" ]] && return 1
     [[ ,${ENABLED_SERVICES} =~ ,"q-" ]] && return 0
     return 1
 }