Fix up sync-crls script and add to Dockerfile.

- Fix some python formatting and import issues
- Fix dockerfile to include sync-crls script
- Adjust sync-crls script to use paths and CLI tools available in the
  Docker container

k8s/shared/crls-sync.yaml

@@ -1,42 +0,0 @@
-apiVersion: batch/v1
-kind: CronJob
-metadata:
-  name: crls
-  namespace: atat
-spec:
-  schedule: "0 * * * *"
-  jobTemplate:
-    spec:
-      template:
-        spec:
-          containers:
-          - name: crls
-            image: $CONTAINER_IMAGE
-            command: [
-              "/bin/sh", "-c"
-            ]
-            args: [
-              "/opt/atat/atst/script/sync-crls"
-            ]
-            envFrom:
-            - configMapRef:
-                name: atst-envvars
-            - configMapRef:
-                name: atst-worker-envvars
-            volumeMounts:
-              - name: atst-config
-                mountPath: "/opt/atat/atst/atst-overrides.ini"
-                subPath: atst-overrides.ini
-              - name: crls-vol
-                mountPath: "/opt/atat/atst/crls"
-          volumes:
-            - name: atst-config
-              secret:
-                secretName: atst-config-ini
-                items:
-                - key: override.ini
-                  path: atst-overrides.ini
-                  mode: 0644
-            - name: crls-vol
-              persistentVolumeClaim:
-                claimName: crls-vol-claim