Source functions in rejoin-stack.sh

stackrc loads localrc and localrc can use functions
like enable_service and disable_service. Make sure
the functions are defined before loading stackrc.

Change-Id: Ied7bbe0d228f252902cc491b8db0738c5071f06b
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
diff --git a/rejoin-stack.sh b/rejoin-stack.sh
index c452694..65ba721 100755
--- a/rejoin-stack.sh
+++ b/rejoin-stack.sh
@@ -5,6 +5,10 @@
 
 TOP_DIR=`dirname $0`
 
+# Import common functions in case the localrc (loaded via stackrc)
+# uses them.
+source $TOP_DIR/functions
+
 source $TOP_DIR/stackrc
 
 # if screenrc exists, run screen