**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=(
        "File location or directory from which to look for the dag. "
        "Defaults to '[AIRFLOW_HOME]/dags' where [AIRFLOW_HOME] is the "
        "value you set for 'AIRFLOW_HOME' config you set in 'airflow.cfg' "),
    default='[AIRFLOW_HOME]/dags' if BUILD_DOCS else settings.DAGS_FOLDER)
ARG_START_DATE = Arg(
    ("-s", "--start-date"),
    help="Override start_date YYYY-MM-DD",
    type=parsedate)
ARG_END_DATE = Arg(
    ("-e", "--end-date"),
    help="Override end_date YYYY-MM-DD",
    type=parsedate)
ARG_OUTPUT_PATH = Arg(
    ("-o", "--output-path",),
    help="The output for generated yaml files",
    type=str,
    default="[CWD]" if BUILD_DOCS else os.getcwd())
ARG_DRY_RUN = Arg(
    ("-n", "--dry-run"),
    help="Perform a dry run for each task. Only renders Template Fields for each task, nothing else",
    action="store_true")
ARG_PID = Arg(
    ("--pid",),
    help="PID file location",
    nargs='?')
ARG_DAEMON = Arg(
    ("-D", "--daemon"),
    help="Daemonize instead of running in the foreground",
    action="store_true")