Honor the log-format parameter for debug logs

[divolgin]

What I Did

Made debug logger honor the log-format command line parameter. This closes #886.

How I Did it

Removed the hardcoded call to NewJSONLogger.

How to verify it

Run ship, look at debug logs. Instead of this:

$ tail -f .ship/debug.log 
{"caller":"github.com/replicatedhq/ship/pkg/state/manager.go","level":"debug","msg":"no saved state exists","path":".ship/state.json","ts":"2019-06-21T22:24:32.557732Z"}
{"caller":"github.com/replicatedhq/ship/pkg/state/manager.go","level":"debug","method":"serializeAndWriteState","stateFrom":"file","ts":"2019-06-21T22:24:32.557762Z"}
{"caller":"github.com/replicatedhq/ship/pkg/specs/interface.go","event":"applicationType.resolve","level":"debug","method":"ResolveRelease","ts":"2019-06-21T22:24:32.558395Z","type":"replicated.app"}

there should be this:

$ tail -f .ship/debug.log 
ts=2019-06-21T22:27:08.532125Z caller=github.com/replicatedhq/ship/pkg/state/manager.go level=debug msg="no saved state exists" path=.ship/state.json
ts=2019-06-21T22:27:08.532148Z caller=github.com/replicatedhq/ship/pkg/state/manager.go level=debug method=serializeAndWriteState stateFrom=file
ts=2019-06-21T22:27:08.532698Z caller=github.com/replicatedhq/ship/pkg/specs/interface.go level=debug method=ResolveRelease event=applicationType.resolve type=replicated.app

Description for the Changelog

Debug logger honors the log-format command line parameter

Picture of a Ship (not required but encouraged)

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