Add a SIGINFO handler to devd.  It will send useful statistics to syslog or
stderr as appropriate.  Currently, the only statistic printed is the number of
events received.

Reviewed by:	eadler
Approved by:	gibbs (co-mentor)
Document the fact that an NFSv4 mount uses the host uuid to uniquely
identify the client to the server. As such, NFSv4 mounts
will break if host_enable="NO" is specified.
This is a content change.

Suggested by:	lars@netapp.com
MFC after:	3 days
Change i_gen in UFS to an unsigned type.

Revert the simplification of the i_gen calculation.
It is still a good idea to avoid zero values and for the case
of old filesystems there is probably no advantage in using
the complete 32 bits anyways.

Discussed with:	bde
MFC after:	4 weeks
style(9) fixes, including the removal of page break characters.  No functional
changes.

Approved by:	gibbs (co-mentor)
Fix typo in vfs_mount(9) item.
Wrap cxgbe declaration around MK_SOURCELESS_UCODE check