Move contents of .bandit.yml to CLI option in .pre-commit-config.yaml

This gets rid of the .bandit.yml file that was being used only against
the test code.

Author: jsf9k

.bandit.yml

@@ -54,7 +54,6 @@ test:
       - any-glob-to-any-file:
           # Add any test-related files or paths.
           - .ansible-lint
-          - .bandit.yml
           - .flake8
           - .mdl_config.yaml
           - .yamllint

.github/labeler.yml

@@ -136,7 +136,9 @@ repos:
         name: bandit (tests tree)
         files: tests
         args:
-          - --config=.bandit.yml
+          # Skip "assert used" check since assertions are used
+          # frequently in pytests.
+          - --skip=B101
   # Run bandit on everything except the "tests" tree
   - repo: https://github.com/PyCQA/bandit
     rev: 1.8.6