Expose hostNetwork settings in helm chart values

[yosefsaputra]

When installing jspolicy in a kubernetes cluster with calico CNI, it needs to be installed with hostNetwork=true. However, this option is not exposed in the helm chart values.

As workaround, we can do post-installation deployment patch

[jaredhancock31]

We also need this, it's forcing us to do some hacks which are not pleasant. any updates?

[mishaprokop4ik]

created the PR with possible fix #132

@FabianKramm can you review it, please?