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 
May be fragile if you check that ```api_descriptors``` directory exists because Crichton doesn't require the resource descriptor documents be under that folder. Can we just check if the ```rdlint``` binary is available?