**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
('-r', '--role'),
    help='Role of the user. Existing roles include Admin, '
         'User, Op, Viewer, and Public',
    required=True,
    type=str,)
ARG_EMAIL = Arg(
    ('-e', '--email'),
    help='Email of the user',
    required=True,
    type=str)
ARG_EMAIL_OPTIONAL = Arg(
    ('-e', '--email'),
    help='Email of the user',
    type=str)
ARG_PASSWORD = Arg(
    ('-p', '--password'),
    help='Password of the user, required to create a user '
         'without --use-random-password',
    type=str)
ARG_USE_RANDOM_PASSWORD = Arg(
    ('--use-random-password',),
    help='Do not prompt for password. Use random string instead.'
         ' Required to create a user without --password ',
    default=False,
    action='store_true')
ARG_USER_IMPORT = Arg(
    ("import",),
    metavar="FILEPATH",
    help="Import users from JSON file. Example format::\n" +
         textwrap.indent(textwrap.dedent('''