rabbitmq-script-wrapper: Use '=', not '==' with Bourne shell's test

Author: dumbbell

packaging/common/rabbitmq-script-wrapper

@@ -16,7 +16,7 @@
 ##
 
 SED_OPT="-E"
-if [ $(uname -s) == "Linux" ]; then
+if [ $(uname -s) = "Linux" ]; then
     SED_OPT="-r"
 fi