Move platform check after localrc

This got moved around with some of the recent cleanups I think.  My CI
was putting FORCE=yes into localrc which used to work.  Noticed doing
some bring-up on F21

Change-Id: I7c0ea6b67b42b768278de0fd41d0c0bfbb572387
diff --git a/stack.sh b/stack.sh
index ec13338..38ecceb 100755
--- a/stack.sh
+++ b/stack.sh
@@ -90,16 +90,6 @@
 # and ``DISTRO``
 GetDistro
 
-# Warn users who aren't on an explicitly supported distro, but allow them to
-# override check and attempt installation with ``FORCE=yes ./stack``
-if [[ ! ${DISTRO} =~ (precise|trusty|7.0|wheezy|sid|testing|jessie|f19|f20|rhel6|rhel7) ]]; then
-    echo "WARNING: this script has not been tested on $DISTRO"
-    if [[ "$FORCE" != "yes" ]]; then
-        die $LINENO "If you wish to run this script anyway run with FORCE=yes"
-    fi
-fi
-
-
 # Global Settings
 # ---------------
 
@@ -151,6 +141,15 @@
 fi
 source $TOP_DIR/stackrc
 
+# Warn users who aren't on an explicitly supported distro, but allow them to
+# override check and attempt installation with ``FORCE=yes ./stack``
+if [[ ! ${DISTRO} =~ (precise|trusty|7.0|wheezy|sid|testing|jessie|f19|f20|rhel6|rhel7) ]]; then
+    echo "WARNING: this script has not been tested on $DISTRO"
+    if [[ "$FORCE" != "yes" ]]; then
+        die $LINENO "If you wish to run this script anyway run with FORCE=yes"
+    fi
+fi
+
 # Check to see if we are already running DevStack
 # Note that this may fail if USE_SCREEN=False
 if type -p screen > /dev/null && screen -ls | egrep -q "[0-9]\.$SCREEN_NAME"; then