Make filebeat and metricbeat use hostnetwork for proper hostname

[evannorstrand]

As the subject states, hostnetwork is required by filebeat and metricbeat to capture the correct hostname of the files/metrics being captured.

[jmlrt]

related to #315 and #321

[mitchellmaler]

@jmlrt I can see that the filebeat chart has this option now but not metricbeat. I like to enable this on the daemonset metriicbeat but not the deployment metricbeat in the chart.

[jmlrt]

@mitchellmaler we have a pr in progress for metricbeat: #315
Don't hesitate to comment also in this PR for being able to enable hostNetwork only on metricbeat daemonset.

[gkcgi]

I would also like to see dnsPolicy and hostNetwork enabled for metricbeat (like filebeat).

[botelastic]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[jmlrt]

still valid