Update logging formatting/encoder

[mxyng]

• Use zap logging for (almost) everything
  • Only thing that isn't using zap.logger is login statements since it won't look as good
• Use combination of gorilla/handlers CustomLoggingHandler and zap.Logger for HTTP request logging
  • We lose request duration but should realistically be part of metrics, not logs
• Use different logging configuration for terminal and non-terminal

Console example. Note DEBUG is actually in green:

$ infra logout -l debug
2021-10-28T12:55:48.116-0700    DEBUG   logging out localhost
2021-10-28T12:55:48.273-0700    DEBUG   cleaning up kubeconfig
2021-10-28T12:55:48.279-0700    DEBUG   cleaning up cache

Kubernetes logs example.

$ stern engine
+ infra-engine-75c5c6657f-2c4db › engine
infra-engine-75c5c6657f-2c4db engine {"level":"info","ts":1635451021.1426108,"msg":"serving on port 443"}
infra-engine-75c5c6657f-2c4db engine {"level":"debug","ts":1635451021.1448,"msg":"endpoint is: localhost:8443"}
infra-engine-75c5c6657f-2c4db engine {"level":"debug","ts":1635451021.1448908,"msg":"not testing DNS lookup for localhost"}
infra-engine-75c5c6657f-2c4db engine {"level":"debug","ts":1635451021.1609979,"msg":"handled request","method":"GET","path":"/healthz","status":200,"size":2}
infra-engine-75c5c6657f-2c4db engine {"level":"debug","ts":1635451021.4673965,"msg":"handled request","method":"GET","path":"/healthz","status":200,"size":2}
infra-engine-75c5c6657f-2c4db engine {"level":"warn","ts":1635451023.4528298,"msg":"could not verify Infra TLS certificates: x509: certificate signed by unknown authority"}
infra-engine-75c5c6657f-2c4db engine {"level":"debug","ts":1635451023.5346036,"msg":"deduplicating users"}
infra-engine-75c5c6657f-2c4db engine {"level":"debug","ts":1635451023.5346286,"msg":"syncing local roles from infra configuration"}
infra-engine-75c5c6657f-2c4db engine {"level":"debug","ts":1635451024.442757,"msg":"handled request","method":"GET","path":"/healthz","status":200,"size":2}

Closes #539

[BruceMacD]

good change moving this to debug

[BruceMacD]

Is the time necessary for terminal errors?

[mxyng]

It's probably not but I find the log line without timestamp looks awkward:

$ infra version
WARN    Infra CLI (v0.3.6-next) is out of date. Please update to 0.3.6.

vs.

$ infra version
2021-10-28T13:58:08.750-0700    WARN    Infra CLI (v0.3.6-next) is out of date. Please update to 0.3.6.

[mxyng]

Another thing is while we don't have long lived commands in Infra CLI right now, it may be the case in the future where timestamps will be useful, e.g. running admin API commands.

[mxyng]

Follow up in #549