Set irrelevant-files for bashate job

This commit sets the tempest-irrelevant-files-2 for the bashate job. We
just need to run the job when we change bash scripts. Currently, bash
scripts are located in the tools/ directory only. So,
"tempest-irrelevant-files-2" is better than "tempest-irrelevant-files".

Change-Id: I0f55ffaa844736056769f1fbeca82fc0cb0a9a86
1 file changed