Explicitly include SPL compat headers

Inclusion of SPL compatibility headers was moved out of the public
header sys/types.h to avoid conflicts with external packages.  Include a
few compatiblity headers explicitly to cope with that change.  Also,
sort some linux-specific inclusions alphabetically.

Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2898
bio_alloc() with __GFP_WAIT never returns NULL

Mark the error handling branch as unlikely() because the current
kernel interface can never return NULL.  However, we want to keep
the error handling in case this behavior changes in the futre.

Plus fix a small style issue.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Isaac Huang <he.huang@intel.com>
Closes #2703
Fix systemd config for zfs-share.service

The zfs-share.service rule needs to be modified to ensure that it
does not execute before zfs-mount.service.

Signed-off-by: Dan Swartzendruber <dswartz@druber.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ralf Ertzinger <ralf@skytale.net>
Closes #2893