add outputFieldFormat parameter

[Issif]

What type of PR is this?

/kind feature

Any specific area of the project related to this PR?

/area config

What this PR does / why we need it:

This PR introduces a new parameter outputFieldFormat:

• outputFieldFormat: "<timestamp>: <priority> <output> <custom_fields> <templated_fields>"

  17:50:29.343280037: Warning NodePort Service Created (user=%ka.user.name service=%ka.target.name resource=%ka.target.resource ns=%ka.target.namespace ports=%ka.req.service.ports) bkey=BValue ckey=CValue dkey=bar

• outputFieldFormat: "<priority> <output> <custom_fields>"

  Warning NodePort Service Created (user=%ka.user.name service=%ka.target.name resource=%ka.target.resource ns=%ka.target.namespace ports=%ka.req.service.ports) bkey=BValue ckey=CValue

• outputFieldFormat: "<output> "

  NodePort Service Created (user=%ka.user.name service=%ka.target.name resource=%ka.target.resource ns=%ka.target.namespace ports=%ka.req.service.ports)

Which issue(s) this PR fixes:

Fixes #

711

Special notes for your reviewer:

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fjogeleit, Issif

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[poiana]

LGTM label has been added.

Git tree hash: 27f14e9a2eff4ad144b2234825911d6bd511fe2e