otherwise it could reslt in assert() failure in getClosestNSEC() for a
half-broken zone that desn't have any NSEC at the zone apex.  also made
a small optimization to detect if a name is the zone origin: just compare
the corresponding node with the origin node.

note: due to the slightly different definition the one used in rdataset.cc
is still there.

this is an intermediate regression due to the previous change.  It's an ugly
workaround, but the real fix is to deprecate the old version ASAP, so I
didn't bother to fix it cleanly.

Due to the extension to RdataSet::find(), the tested code doesn't have to
be modified.

and use it in zone data updater to preserve the previous behavior.

except for RRSIG for NSEC3, which is a bit trickier and will be handled
separately.

looks like we need to update the updater first, so it's disabled for now.

so that we can test loading related in a closer place to the load related
classes.

not directly related to the subject of this branch, but this will help
the development.

From http://bind10.isc.org/ticket/2468#comment:2 to help troubleshoot later.

Okayed via jabber.

and suggest checking output from msgq using -v.

previously it could result in exception (by the attempt of killing sockcreator
as a chuser'ed process) during initial setup failure, leading to unclean
shutdown.  the revised code prevents it from happening, and also makes the
code concise by unifying the common logic.

so, it now just prints some hints to stderr and exits.

it even suggests restarting as a root.

it now includes textual representation of errno, and, if it's EACCES
("permission denied") the messsage suggesting restarting as a super user.

this is necessary for Solaris. okayed on jabber.

 commit.

do this only when stdin is a terminal; otherwise some lettuce tests will fail,
and it would possibly break some other automatic processing scripts.

based on review discussions.  it makes sense as we cannot assume its address
is never needed in non test applications.