**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
"""Add this argument to an ArgumentParser"""
        parser.add_argument(*self.flags, **self.kwargs)
def positive_int(value):
    """Define a positive int type for an argument."""
    try:
        value = int(value)
        if value > 0:
            return value
    except ValueError:
        pass
    raise argparse.ArgumentTypeError(f"invalid positive int value: '{value}'")
ARG_DAG_ID = Arg(
    ("dag_id",),
    help="The id of the dag")
ARG_TASK_ID = Arg(
    ("task_id",),
    help="The id of the task")
ARG_EXECUTION_DATE = Arg(
    ("execution_date",),
    help="The execution date of the DAG",
    type=parsedate)
ARG_TASK_REGEX = Arg(
    ("-t", "--task-regex"),
    help="The regex to filter specific task_ids to backfill (optional)")
ARG_SUBDIR = Arg(
    ("-S", "--subdir"),