bug#30224: 'mount -t ecryptfs ...' command refers to /bin/mount, bin/umount, etc

[brendan.tildesley@openmailbox.org]

I noticed this a while ago but probably won't get around to fixing it, so I'm just posting a bug report.
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b@ui ~$ sudo mount -t ecryptfs encrypted-dir mount-dir
Passphrase:
Select cipher:
[...]
Selection [aes]:
Select key bytes:
 1) 16
 2) 32
 3) 24
Selection [16]:
Enable plaintext passthrough (y/n) [n]:
Enable filename encryption (y/n) [n]: y
Filename Encryption Key (FNEK) Signature [...]:
Attempting to mount with the following options:
  ecryptfs_unlink_sigs
  ecryptfs_fnek_sig=[...]
  ecryptfs_key_bytes=16
  ecryptfs_cipher=aes
  ecryptfs_sig=[...]
Failed to execute /bin/mount command: No such file or directory
Error mounting eCryptfs: [-2] No such file or directory
Check your system logs; visit <http://ecryptfs.org/support.html>
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There are many references  to /bin/ in the ecryptfs source code, even including  /bin/umount. for example:

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b@ui ~/temp/ecryptfs-utils-111$ ag exec.*bin/
src/utils/mount.ecryptfs.c
417:            execl("/bin/mount", "mount", "-i", "--no-canonicalize", "-t", "ecryptfs", fullpath_source, fullpath_target, "-o", opts, NULL);
421:            perror("Failed to execute /bin/mount command");

src/desktop/ecryptfs-mount-private.desktop.in
4:Exec=/usr/bin/ecryptfs-mount-private

src/desktop/ecryptfs-setup-private.desktop.in
4:Exec=/usr/bin/ecryptfs-setup-private

src/utils/mount.ecryptfs_private.c
833:            execl("/bin/umount", "umount", "-i", "-l", ".", NULL);

src/pam_ecryptfs/pam_ecryptfs.c
375:                    execl("/sbin/mount.ecryptfs_private",
389:                    execl("/sbin/umount.ecryptfs_private",

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