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Conflicts:
	src/bin/dhcp6/dhcp6_srv.cc
	src/lib/dhcpsrv/lease.cc
	src/lib/dhcpsrv/tests/lease_unittest.cc

 - DUID is checked in Lease6::decline() unit-test.

Reviewed on jabber.

Save the error string before using it to minimize the possibility of
it changing between when it gets generated and reviewed and when it
gets logged.

Update the code to clear the errno variable before making calls that
might use it.  This should limit problems with one section of code
creating an inappropriate error message due to looking at an errno
set by some other section ofcode.

 - Lease6::decline() implemented
 - DUID::generateEmpty() implemented
 - Unit-tests for Decline (not include address, not include IA_NA)
   implemented
 - several comments updated
 - logging corrected and reworded

 - Statistic is now reset properly in DeclineTest.*

Conflicts:
	src/bin/dhcp4/tests/Makefile.am

 - moved lease decline to Lease::decline()

 - Explanation why are we not updating assigned-addresses
 - DHCP4_DECLINE_LEASE message reworded as suggested
 - processDecline method described properly
 - declineNonMatchingIPAddresses description updated
 - global declined-addresses statistic added and tested
 -