Add example dashboards using the time series visual builder

[monicasarbu]

Replace #3981.

Several improvements are done to the Metricbeat system dashboards:

• change navigation to be on top of the page in order to occupy less space
• add two dashboards that are using the widgets built with the new time series visual builder
• re-arrange the old dashboards to accommodate the new navigation bar

Here are a few screenshots with the result:

cc-ed: @simianhacker

[andrewkroh]

Why is there a "Top 10 hosts by CPU" table on the host overview dashboard? Maybe this should be processes instead.

[monicasarbu]

@andrewkroh That's a good question. The second screenshot is a dashboard that shows system details per host. By default, it shows the details for all the hosts, but you can select a host by clicking on one host from the "top 10 hosts" widget. This way, you can easier have a per host view. This is a temporary workaround until we have links between dashboards.

[andrewkroh]

Ok, makes sense. I use a tag cloud of hostnames for a similar purpose.

[andrewkroh]

With the "alpha2" tag here, do you want to hold off the merge until after alpha1 is released?