**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
ARG_EXCLUDE_SUBDAGS = Arg(
    ("-x", "--exclude-subdags"),
    help="Exclude subdags",
    action="store_true")
ARG_EXCLUDE_PARENTDAG = Arg(
    ("-X", "--exclude-parentdag"),
    help="Exclude ParentDAGS if the task cleared is a part of a SubDAG",
    action="store_true")
ARG_DAG_REGEX = Arg(
    ("-R", "--dag-regex"),
    help="Search dag_id as regex instead of exact string",
    action="store_true")
ARG_SAVE = Arg(
    ("-s", "--save"),
    help="Saves the result to the indicated file.")
ARG_IMGCAT = Arg(
    ("--imgcat", ),
    help=(
        "Displays graph using the imgcat tool."),
    action='store_true')
ARG_RUN_ID = Arg(
    ("-r", "--run-id"),
    help="Helps to identify this run")
ARG_CONF = Arg(
    ('-c', '--conf'),
    help="JSON string that gets pickled into the DagRun's conf attribute")
ARG_EXEC_DATE = Arg(
    ("-e", "--exec-date"),
    help="The execution date of the DAG",
    type=parsedate)