**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
type=str)
ARG_CONN_EXPORT = Arg(
    ('file',),
    help='Output file path for exporting the connections',
    type=argparse.FileType('w', encoding='UTF-8'))
ARG_CONN_EXPORT_FORMAT = Arg(
    ('--format',),
    help='Format of the connections data in file',
    type=str,
    choices=['json', 'yaml', 'env'])
ARG_USERNAME = Arg(
    ('-u', '--username'),
    help='Username of the user',
    required=True,
    type=str)
ARG_USERNAME_OPTIONAL = Arg(
    ('-u', '--username'),
    help='Username of the user',
    type=str)
ARG_FIRSTNAME = Arg(
    ('-f', '--firstname'),
    help='First name of the user',
    required=True,
    type=str)
ARG_LASTNAME = Arg(
    ('-l', '--lastname'),
    help='Last name of the user',
    required=True,
    type=str)
ARG_ROLE = Arg(