Handle Docker errors correctly (#196)

* Handle Docker errors correctly

docker intercepts errors from requests and returns its own errors, so we actually need to expect a docker error here

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/molecule_plugins/docker/driver.py

@@ -239,11 +239,10 @@ def sanity_checks(self):
         log.info("Sanity checks: '%s'", self._name)
         try:
             import docker
-            import requests
 
             docker_client = docker.from_env()
             docker_client.ping()
-        except requests.exceptions.ConnectionError:
+        except docker.errors.DockerException:
             msg = (
                 "Unable to contact the Docker daemon. "
                 "Please refer to https://docs.docker.com/config/daemon/ "