core: convert more output to `output` method

lib/vagrant/action/builtin/wait_for_communicator.rb

@@ -50,7 +50,7 @@ module Vagrant
           end
 
           # Wait for a result or an interrupt
-          env[:ui].info I18n.t("vagrant.boot_waiting")
+          env[:ui].output(I18n.t("vagrant.boot_waiting"))
           while ready_thr.alive? && states_thr.alive?
             sleep 1
             return if env[:interrupted]
@@ -72,7 +72,7 @@ module Vagrant
             raise Errors::VMBootTimeout
           end
 
-          env[:ui].info I18n.t("vagrant.boot_completed")
+          env[:ui].output(I18n.t("vagrant.boot_completed"))
 
           # Make sure our threads are all killed
           ready_thr.kill

lib/vagrant/plugin/v2/communicator.rb

@@ -49,6 +49,10 @@ module Vagrant
         # wait_for_ready waits until the communicator is ready, blocking
         # until then. It will wait up to the given duration or raise an
         # exception if something goes wrong.
+        #
+        # @param [Fixnum] duration Timeout in seconds.
+        # @return [Boolean] Will return true on successful connection
+        #   or false on timeout.
         def wait_for_ready(duration)
           # By default, we implement a naive solution.
           begin