Switch to use the parser from devfile/parser in odo repo

[yangcao77]

After devfile/api#183 is completed, we want to switch to use the parser from devfile/parser repo, and remove the parser defined in Odo.

Since the parser library is using devfile go struct defined in devfile/api, this requires some code changes to Odo code base to integrate with the new devfile go struct. product code and test code changes are expected.

**Note: the validate package will temporarily be left in odo, the validator will be implemented in devfile/api repo.
For any call to the following parser functions in odo, need to call validate.ValidateDevfileData after, separately:
ParseAndValidate, ParseFromURLAndValidate, ParseFromDataAndValidate,

[yangcao77]

/assign