[FOR REVIEW] [JENKINS-21190 and JENKINS-21191]- Views can disable automatic refreshes on their pages

I've added a new extension method to View, which disables automatic refreshes inside its layout.
Such feature would be very useful for views with static contents.

As example, such feature allows to avoid automatic refreshes inside [Dynamic Search View Plugin][1].

[1]:https://wiki.jenkins-ci.org/display/JENKINS/Dynamic+Search+View+Plugin