Main navigation and action bar should be sticky

In trunk if a user has 20+ machines on their node listing page, the navigation and action bar should be always in the users view port.

If this is not the case and a user has many machines (say 100+), they would have to scroll all the way back to the top to select an action. Same thing goes on the node details page, if the header isn't sticky the user would have to scroll back to the top of the page to perform an action. If there is an important notification related to an action, there is a chance they miss it because they can't see it.

Navigation + action bar (panel) should be sticky as per the designs