**Apache Airflow version**: 1.10.12

**Kubernetes version** : 1.17.9

**Environment**:

- **Cloud provider or hardware configuration**: Azure Kubernetes Service
- **OS** (e.g. from /etc/os-release): Linux
- **Install tools**: Helm chart (/chart in repo) 
- **Others**:

**What happened**:
Pod cannot run since `airflow-cleanup-pods` is not in $PATH
```
Error: failed to start container "airflow-cleanup-pods": Error response from daemon: OCI runtime create failed: container_linux.go:349: starting container process caused "exec: \"airflow-cleanup-pods\": executable file not found in $PATH": unknown
```

**What you expected to happen**: 
Cleanup job pod runs

<!-- What do you think went wrong? -->

**How to reproduce it**:
* Deploy Helm Chart
* Manually trigger `airflow-cleanup ` CronJob 
* See it cannot run since `airflow-cleanup-pods` is not in $PATH
airflow/cli/cli_parser.py
[
                {
                    "email": "foo@bar.org",
                    "firstname": "Jon",
                    "lastname": "Doe",
                    "roles": ["Public"],
                    "username": "jondoe"
                }
            ]'''), " " * 4))
ARG_USER_EXPORT = Arg(
    ("export",),
    metavar="FILEPATH",
    help="Export all users to JSON file")
ARG_CREATE_ROLE = Arg(
    ('-c', '--create'),
    help='Create a new role',
    action='store_true')
ARG_LIST_ROLES = Arg(
    ('-l', '--list'),
    help='List roles',
    action='store_true')
ARG_ROLES = Arg(
    ('role',),
    help='The name of a role',
    nargs='*')
ARG_AUTOSCALE = Arg(
    ('-a', '--autoscale'),
    help="Minimum and Maximum number of worker to autoscale")
ARG_SKIP_SERVE_LOGS = Arg(
    ("-s", "--skip-serve-logs"),