feature: add dnsPolicy to fluentbit, more options to kubernetes filter

[jjsiv]

Signed-off-by: Jedrzej Kotkowski jedrzejk143@gmail.com

What this PR does / why we need it:

• Adds dnsPolicy option to FluentBit CRD
• Adds these options to FluentBit k8s filter plugin: dnsRetries, dnsWaitTime, useKubelet, kubeletPort, kubeletHost, kubeMetaCacheTTL, kubeTokenTTL

Which issue(s) this PR fixes:

Fixes #524, #514

Does this PR introduced a user-facing change?

Users can now specify dnsPolicy for FluentBit as well as more options for Kubernetes filter plugin

Additional documentation, usage docs, etc.:

[benjaminhuo]

@jjsiv Thanks for this PR, it's a big enhancement!
Would you please run make docs-update to update the API docs?
You'll need to rebase your branch before run this because there're some other new code checked in already

[jjsiv]

@benjaminhuo for whatever reason running docs-update didn't actually update the docs for kubernetes filter, only a bunch of other stuff that I didn't include in the commit. I added it manually, maybe it would be worth having a look at later

[benjaminhuo]

@benjaminhuo for whatever reason running docs-update didn't actually update the docs for kubernetes filter, only a bunch of other stuff that I didn't include in the commit. I added it manually, maybe it would be worth having a look at later

Great, thank you!