The Linux equivalence of 'mount -F zfs' is 'mount -t zfs'.
+ The 'dev' ('devices') option never show up in a mount list
  Test this by trying to create a 'zero' device.
unshare doesn't exist on Linux, instead exportfs is used. But it have
quite different usage. And can't run as normal user...
Remove leading slash to disk images in TESTDIR (ended up with double
which made the test fail).
The expected return value from 'mmap_exec' on Linux is 22, not 13.
Change hardcoded '/dev/{dsk,rdsk' to variable 'DEV_{DSK,RDSK}DIR'.
Linux does not separate them and puts everything in '/dev'.
In Linux, we need to add the '-d $TEST_BASE_DIR' to 'zpool import' for it to find the raw disk files.
sleep 1 - On Linux, we need to add a 'sleep 1' between creating a ZVOL and accessing it
to make sure udevd have had time to create the device node.
Use /usr/bin/env to load bash, instead of hardcoding the hash-bang to /usr/bin/bash.
!!! SCRIPTS STILL NEEDS TO BE PORTED !!!