Feature/rdlint

This PR adds support for running Crichton lint command `rdlint`.  If the command fails, the CI run will fail.
If there is no api_descriptors directory in the project, the command will not be run.

Ad-hoc tested.

@miwest929 @jcarres-mdsol @asmith-mdsol 
```rdlint``` should be smart enough to not run (or just pass by default) if there are no resource description docs to validate.