Keep only two routers in filelog

[VihasMakwana]

The CRI-O and contained logs are similar,
<timestamp> <stdout|stderr> <logtag> <log message>

The timestamp is of the rfc3339Nano specification. The PR signalfx/splunk-otel-collector-chart#817 has updated the timestamp to rfc3339Nano.
I think we can keep two routers only:

One for docker
One for cri-o/containerd

We can use the existing cri-o parser. It covers both, Zulu timestamps and timestamps with timezone info.

Related issue: signalfx/splunk-otel-collector-chart#829

[VihasMakwana]

I can work on this one as I'm working on the attached issue

[povilasv]

I like this, this would simplify the config a bit :)

[TylerHelmuth]

Is this a non-breaking change?

[VihasMakwana]

yes, I believe.

[VihasMakwana]

maybe I can roll out a PR and you guy can have a look?

[TylerHelmuth]

Sure. I'm most interested in ensuring that the data the the 2 separate routers were intending to capture really can be capture by the same router.