Fix syntax error in lib/tempest

Fix syntax error in lib/tempest:
 Created tempest configuration file:
 21:06:30 ++ CINDER_MULTI_LVM_BACKEND=False
 21:06:30 ++ '[' False == 'True ]'
 21:06:30 /home/stack/devstack/lib/tempest: line 278: [: missing `]'

Change-Id: Ib4e393dad12751bdfb0e6f8fac3accd380a1f760
diff --git a/lib/tempest b/lib/tempest
index e3faa2e..277c68a 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -275,7 +275,7 @@
 
     # Volume
     CINDER_MULTI_LVM_BACKEND=$(trueorfalse False $CINDER_MULTI_LVM_BACKEND)
-    if [ $CINDER_MULTI_LVM_BACKEND == "True "]; then
+    if [ $CINDER_MULTI_LVM_BACKEND == "True" ]; then
         iniset $TEMPEST_CONF volume multi_backend_enabled "True"
         iniset $TEMPEST_CONF volume backend1_name "LVM_iSCSI"
         iniset $TEMPEST_CONF volume backend2_name "LVM_iSCSI_2"