oe-init-build-env-memres: use shell instead of Python to show the port number

(From OE-Core rev: 024e95696bad8f2ff09e1fda28c96d89d10999a1)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

oe-init-build-env-memres

@@ -52,4 +52,4 @@ else
 fi
 bitbake --server-only -t xmlrpc -B localhost:$port
 export BBSERVER=localhost:$port
-echo "Bitbake server started on port %s, use bitbake -m to shut it down"
+echo "Bitbake server started on port $port, use bitbake -m to shut it down"