Avoid here-documents in systemd mount generator

On some systems - openSUSE, for example - there is not yet a writeable
temporary file system available, so bash bails out with an error,

  'cannot create temp file for here-document: Read-only file system',

on the here documents in zfs-mount-generator. The simple fix is to
change these into a multi-line echo statement.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-By: Richard Laager <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Signed-off-by: Lorenz Hüdepohl <[email protected]>
Closes #9802 

0 files changed, 0 insertions, 0 deletions