[master] Trac #2994 is about DHCPv4 server not v6

okayed by muks on jabber
[master] add classify.h to distfiles and installation

This was noticed when trying to do distcheck build on non-Linux.
(Our non-Linux automated builder disappeared.)
I tested this and okayed by muks on jabber.
[master] remove "update" from confusing changelog entry 672

It previously looked like a command name.
suggested via jabber
[master] add asterisk to few entries

for a Backward incompatible or operational change.
[master] move EXTRA_DISTs outside of  if HAVE_GTEST

The distcheck builders are unavailable due to vmware issues.
wlodek noticed missing distfiles in my generated tarball when
he tried to do a gtest build.

I verified the patch.
Patch okayed by TomM on jabber.
[3364] use noinst_ instead of nodist_ and a libtool hack for dhcp hooks tests

Got rid of nodistdir and used noinst_ instead of nodist_
for dhcp hooks tests

Also use -rpath /nowhere as a hack to trigger libtool to not create a
convenience archive, resulting in shared modules.