Set the lint job shell to /bin/bash

Set the lint job shell to /bin/bash

The default builder in Jenkins is '/bin/sh -ex'. Because of this lint
jobs are failing that we assume won't as everywhere else we've used
/bin/bash and explitily set options when needed.

Explicitly setting these jobs to use /bin/bash should keep Jenkins from
failing builds without reporting the lint results.

Change-Id: Ibe6cad979d6dcf30e7991873c9ac446ae3bf3a8b
Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>