Validate command flag input by adding cli hook

[life1347]

Fix #1014

$ fission fn create name t4
Fatal error: No valid flags are provided. Please ensure flag name has "--" prefix.

$ fission fn create --name t4 --env nodejs \
  --code /github.com/fission/fission/examples/nodejs/* --minscale 0 --maxscale 4 \
  --executortype newdeploy sfdfhjdhkjsdf
Fatal error: Unable to parse flags: --code, --executortype
The argument should have only one input value. Please quote the input value if it contains wildcard characters(*).

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