openbsd: fix mount helper

bootstrap/openbsd/usr/sbin/mount_circle-userstore

 #!/bin/sh
 
-if [ -eq x"$@" x"-o rw none /store" ]; then
+
+op1="-o.rw.none./store"
+op2=`echo -n $@ | sed  "s/ /./g"`
+
+if [ $op1 = $op2 ]; then
 	/usr/local/bin/usmb -c /etc/circle/usmb.conf userstore
-else:
+else
 	echo "It only works with following fstab line:"
 	echo "none /store circle-userstore rw 0 0"
 fi