Migrate bandit options to pyproject.toml

... so that these options can be used by different tools than
tox/pre-commit more easily.

Change-Id: If4d3c80bb0824594c671d89feef868f8cd059ceb
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

.pre-commit-config.yaml

@@ -21,7 +21,7 @@ repos:
     rev: 1.8.6
     hooks:
       - id: bandit
-        args: ['-x', 'tests']
+        args: ['-c', 'pyproject.toml']
   - repo: https://github.com/asottile/pyupgrade
     rev: v3.20.0
     hooks:

pyproject.toml

@@ -34,3 +34,6 @@ Repository = "https://opendev.org/openstack/oslo.vmware"
 packages = [
     "oslo_vmware"
 ]
+
+[tool.bandit]
+exclude_dirs = ["tests"]