Delayed umount

Hi Folks

I am not convinced this is necessary but it does not hurt, so I added
another function to mount_modules to allow delayed umount

Tests show

SALT# mount_modules
SALT# umount_modules
SALT# mount_modules
SALT# umount_delayed &
SALT# mount_modules
SALT# umount_delayed &
[1]-  Terminated                 umount_delayed
[2]+  Done                       umount_delayed

Mar 30 13:55:29 SALT mount_modules: mounted /dev/sda2 on /tmp/tmp.GVlxkl
Mar 30 13:55:38 SALT umount_delayed: unmount of /lib/modules/4.4.3-wrap
scheduled in 10 seconds
Mar 30 13:55:45 SALT mount_modules: killing umount_delayed process-id=17932
Mar 30 13:55:55 SALT umount_delayed: unmount of /lib/modules/4.4.3-wrap
scheduled in 10 seconds
Mar 30 13:56:05 SALT umount_modules: unmounted /lib/modules/4.4.3-wrap
Mar 30 13:56:06 SALT umount_modules: unmounted /tmp/tmp.GVlxkl

There are a few drawbacks with the invocation

- umount_delayed must be pushed to the background to terminate
- processes in the background spit out termination messages

cheers

ET



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