Disable verbose output accessing PATH

lib/vagrant/util/which.rb

@@ -29,12 +29,18 @@ module Vagrant
           exts = ENV['PATHEXT'].split(';')
         end
 
+        current_verbose = $VERBOSE
+        $VERBOSE = nil
+        begin
           ENV['PATH'].encode('UTF-8', 'binary', invalid: :replace, undef: :replace, replace: '').split(File::PATH_SEPARATOR).each do |path|
             exts.each do |ext|
               exe = "#{path}#{File::SEPARATOR}#{cmd}#{ext}"
               return exe if File.executable? exe
             end
           end
+        ensure
+          $VERBOSE = current_verbose
+        end
 
         return nil
       end