Fix FROM_PACKAGE checks for novnc and spice

The logic for installing novnc and spice from packages is broken,
which makes it impossible to install from git, which makes bug
1248923 more serious.

Change-Id: I9ae722a5470a16555bca9018da342485f6d3e896
Related-Bug: 1248923
diff --git a/lib/nova b/lib/nova
index eacd415..b9fa3e1 100644
--- a/lib/nova
+++ b/lib/nova
@@ -589,7 +589,8 @@
 
     if is_service_enabled n-novnc; then
         # a websockets/html5 or flash powered VNC console for vm instances
-        if trueorfalse True "$NOVNC_FROM_PACKAGE"; then
+        NOVNC_FROM_PACKAGE=`trueorfalse True $NOVNC_FROM_PACKAGE`
+        if [ "$NOVNC_FROM_PACKAGE" = "True" ]; then
             NOVNC_WEB_DIR=/usr/share/novnc
             install_package novnc
         else
@@ -600,7 +601,8 @@
 
     if is_service_enabled n-spice; then
         # a websockets/html5 or flash powered SPICE console for vm instances
-        if trueorfalse True "$SPICE_FROM_PACKAGE"; then
+        SPICE_FROM_PACKAGE=`trueorfalse True $SPICE_FROM_PACKAGE`
+        if [ "$SPICE_FROM_PACKAGE" = "True" ]; then
             SPICE_WEB_DIR=/usr/share/spice-html5
             install_package spice-html5
         else