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Had to use memset to reset sa_action structure. Without that the signal
handled wasn't installed correctly because of the random data in the
sigaction structure and caused unit tests to fail.

Starting lease manager in the server constructor implied the use of the
default memfile for a short period until the server is configured. The
default memfile configuration used the persistence (writing leases to disk)
which in many cases required root privileges. This caused some unit tests
to fail.

Fixed one typo and clarified in the configuration examples that it is up
to the client to pick the renew and rebind timers if the server doesn't
send option 58 and 59.

The presence of this field caused cppcheck failures.

Conflicts:
	ChangeLog
	src/bin/dhcp6/kea_controller.cc
	src/lib/dhcpsrv/daemon.h

 - ChangLog updated (b10-dhcp4 => DHCPv4 server)
 - stand-alone mode removed in Kea4,Kea6
 - getInstance() used instead of server_
 - ctrl_dhcp4_srv.cc: one stringstream instance now shared by all error messages
 - ctrl_dhcp4_srv.h: comments cleaned up
 - Added log message for received configuration
 - kea_controller.cc: Unnecessary header/using namespace removed
 - *.json files are now cleaned up in src/bin/dhcp4/tests
 - added comment that explains lack of tests for Bundy backend
 - kea_controller_unittest.cc now uses the same filename everywhere

Changes also applied to Kea6 (where applicable).

Without that change the name of the process will be truncated if the
command line to start the process is out of bounds of the window size.
When running unit tests on the build farm there is in fact no window so
the ps function wouldn't find a pid of Kea and the shell-based tests
would fail.

Implements TSIG in D2

Fixed Conflicts:
	src/bin/d2/nc_trans.cc
	src/bin/d2/nc_trans.h
	src/bin/d2/tests/nc_test_utils.cc
	src/bin/d2/tests/nc_trans_unittests.cc