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Put the traceback handler in the top level of all the python daemons and
some utility programs. The programs that don't do logging are not
included.

A function that catches exceptions, prints them to correct places and
exists.

 - hooks documentation updated
 - dhcp4 message logs updated
 - long lines wrapped in dhcp4_srv.cc
 - unit-test names now use camel notation
 - Pkt4::bufferOut_ renamed to buffer_out_

The new hooks tests require two shared libraries, which were not generated
when static linking was used and caused tests to fail. This patch forces
generation of these shared libraries. Okayed on jabber.

This commit also changes the ParserContext copy constructor and assignment
operator to handle copying of the NULL shared pointers.

It was used in tests only. We may abuse the shutdown command for that.

The joker in the pack here is io_address.h, required by the DHCP
header files.  That refers to the headers-only version of Boost
ASIO included in the BIND 10 source kit, so the ASIO files need
to be copied as well.

Also, removed line wraps in toText function and added validation of the
flags field when calling unpack.

It is a testing command only, user is expected to examine configuration
by config show. So don't show it.