add quiet mode

@dubeejw commented on [Wed Mar 22 2017](https://github.com/apache/incubator-openwhisk/issues/2062)

CLI code is hard to read as the externalized string package being used requires a map of keys and values. This process should be abstracted to make the code more readable.

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@dubeejw commented on [Wed Mar 22 2017](https://github.com/apache/incubator-openwhisk/issues/2062#issuecomment-288584469)

@csantanapr, @mdeuser, this is technical debt, and should be fixed ASAP.

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@csantanapr commented on [Thu Mar 23 2017](https://github.com/apache/incubator-openwhisk/issues/2062#issuecomment-288710525)

Looking forward to a PR :)

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@rabbah commented on [Thu Mar 23 2017](https://github.com/apache/incubator-openwhisk/issues/2062#issuecomment-288711448)

As part of doing this, consider: adding quiet mode which omits "ok:" and "error:" lines so that raw Json responses are more amenable to post processing.

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@markusthoemmes commented on [Thu Mar 23 2017](https://github.com/apache/incubator-openwhisk/issues/2062#issuecomment-288724315)

Alternatively: `--json` or `--raw` to explicitly make the output machine-readable?

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@dubeejw commented on [Thu Mar 23 2017](https://github.com/apache/incubator-openwhisk/issues/2062#issuecomment-288739227)

@markusthoemmes, @rabbah, a flag like `--raw` would be accomplished through this issue: https://github.com/openwhisk/openwhisk/issues/2064.

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@akrabat commented on [Wed Apr 12 2017](https://github.com/apache/incubator-openwhisk/issues/2062#issuecomment-293527983)

A quiet mode would be handy for property get too. That way I wouldn't need to do this:

wsk property get --cliversion | rev | cut -f1 | rev