Make max wait time a constant

So it can be used elsewhere in the code

qa/qa/support/waiter.rb

@@ -3,9 +3,11 @@
 module QA
   module Support
     module Waiter
+      DEFAULT_MAX_WAIT_TIME = 60
+
       module_function
 
-      def wait(max: 60, interval: 0.1)
+      def wait(max: DEFAULT_MAX_WAIT_TIME, interval: 0.1)
         QA::Runtime::Logger.debug("with wait: max #{max}; interval #{interval}")
         start = Time.now