**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
USERS_COMMANDS = (
    ActionCommand(
        name='list',
        help='List users',
        func=lazy_load_command('airflow.cli.commands.user_command.users_list'),
        args=(ARG_OUTPUT,),
    ),
    ActionCommand(
        name='create',
        help='Create a user',
        func=lazy_load_command('airflow.cli.commands.user_command.users_create'),
        args=(
            ARG_ROLE, ARG_USERNAME, ARG_EMAIL, ARG_FIRSTNAME, ARG_LASTNAME, ARG_PASSWORD,
            ARG_USE_RANDOM_PASSWORD
        ),
        epilog=(
            'examples:\n'
            'To create an user with "Admin" role and username equals to "admin", run:\n'
            '\n'
            '    $ airflow users create \\\n'
            '          --username admin \\\n'
            '          --firstname FIRST_NAME \\\n'
            '          --lastname LAST_NAME \\\n'
            '          --role Admin \\\n'
            '          --email admin@example.org'
        )
    ),
    ActionCommand(
        name='delete',
        help='Delete a user',