Feature Request: EFS Watchdog Service to Handle Parent Directory Moves of Mount Points

**Description:**
The EFS watchdog service currently terminates connections when a parent directory containing an EFS mount point is moved, even though the Linux system successfully updates the mount points. This creates issues during application installations that involve directory restructuring.

**Current Behavior:**

1. When an EFS mount point's parent directory is moved:
- Linux updates mount points correctly (reflected in /etc/mtab and /proc/mounts)
- EFS watchdog service continues to reference old absolute path in state files
- Watchdog terminates stunnel/efs-proxy connection when original path isn't found
- File system becomes inaccessible

**Reproduction Steps:**

```
# Mount EFS
sudo mount -t efs -o iam,tls,accesspoint=fsap-xxx fs-xxx:/ efs/path1/mnt1/

# Verify mount
mount | grep nfs4
# Shows successful mount

# Move parent directory
mv ~/efs/path1 ~/efs/path2

# Try to access mount point
cat ~/efs/path2/mnt1/file1
# Process hangs due to terminated connection

```

**Proposed Enhancement:**
Enhance the watchdog service to:

- Handle mount point path changes gracefully
- Update state files when parent directories are moved

No source files, tests, or entry points are named. Start by locating the EFS watchdog service and its state-file handling, then reproduce the parent-directory move described in the issue; done means the moved mount remains accessible and the watchdog no longer terminates its connection.

Written by the indexing model from the issue text.