revid-cli: log missing parameters which have defaults as info messages, not warnings.

None of the following should be warnings:
{"level":"warn","time":"2019-03-02T21:15:31.366Z","caller":"revid/config.go:129","message":"revid:no LogLevel mode defined, defaulting","LogLevel":16}
{"level":"warn","time":"2019-03-02T21:15:31.366Z","caller":"revid/config.go:138","message":"revid:no input type defined, defaulting","input":1}
{"level":"warn","time":"2019-03-02T21:15:31.366Z","caller":"revid/config.go:163","message":"revid:no input codec defined, defaulting","inputCodec":6}
{"level":"warn","time":"2019-03-02T21:15:31.367Z","caller":"revid/config.go:166","message":"revid:defaulting quantization","quantization":40}
{"level":"warn","time":"2019-03-02T21:15:31.367Z","caller":"revid/config.go:191","message":"revid:no output defined, defaulting","output":5}
{"level":"info","time":"2019-03-02T21:15:31.367Z","caller":"revid/config.go:197","message":"revid:defaulting frames per clip for http out","framesPerClip":560}
{"level":"warn","time":"2019-03-02T21:15:31.368Z","caller":"revid/config.go:207","message":"revid:no burst period defined, defaulting","burstPeriod":10}
{"level":"warn","time":"2019-03-02T21:15:31.368Z","caller":"revid/config.go:218","message":"revid:no width defined, defaulting","width":1280}
{"level":"warn","time":"2019-03-02T21:15:31.368Z","caller":"revid/config.go:223","message":"revid:no height defined, defaulting","height":720}
{"level":"warn","time":"2019-03-02T21:15:31.369Z","caller":"revid/config.go:228","message":"revid:no frame rate defined, defaulting","fps":25}
{"level":"warn","time":"2019-03-02T21:15:31.369Z","caller":"revid/config.go:233","message":"revid:no bitrate defined, defaulting","bitrate":400000}
{"level":"warn","time":"2019-03-02T21:15:31.369Z","caller":"revid/config.go:238","message":"revid:no intra refresh defined, defaulting","intraRefresh":100}
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