**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
help="Default value returned if variable does not exist")
ARG_JSON = Arg(
    ("-j", "--json"),
    help="Deserialize JSON variable",
    action="store_true")
ARG_VAR_IMPORT = Arg(
    ("file",),
    help="Import variables from JSON file")
ARG_VAR_EXPORT = Arg(
    ("file",),
    help="Export all variables to JSON file")
ARG_PRINCIPAL = Arg(
    ("principal",),
    help="kerberos principal",
    nargs='?')
ARG_KEYTAB = Arg(
    ("-k", "--keytab"),
    help="keytab",
    nargs='?',
    default=conf.get('kerberos', 'keytab'))
ARG_INTERACTIVE = Arg(
    ('-N', '--interactive'),
    help='Do not capture standard output and error streams '
         '(useful for interactive debugging)',
    action='store_true')
ARG_FORCE = Arg(
    ("-f", "--force"),
    help="Ignore previous task instance state, rerun regardless if task already succeeded/failed",
    action="store_true")
ARG_RAW = Arg(("-r", "--raw"), argparse.SUPPRESS, "store_true")