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This change applies to the Memfile backend and is intended to significantly
improve its performance.

This change should seriously rise the performance of the server as the
server seem to spend a lot of time executing the validate function.

This is an ad-hoc workaround for the failures in stats tests. It's okayed to be
committed on jabber. Note that this workaround should be removed after a
fundamental fix for stats tests (#1668) is done. An investigation task for the
fix will be worked on #2689.  For the details of the failures, see #2666 and
http://git.bind10.isc.org/~tester/builder//BIND10-valgrind/20130212205704-CentOS5-x86_64-GCC/logs/unittests.out

 commit.

Conflicts:
	ChangeLog

Also, trivial change: removed spurious brackets in the previous entry.

Note: This change fulfills both 2699 (lease4) and 2703 (lease6).

Conflicts:
	src/lib/dhcpsrv/alloc_engine.cc

The selectSubnet() function offers two ways to find a subnet for a
particular interface: using the name of the interface that the subnet is
configured for; and using the packet source address. Also, the redundant
warning is removed if suitable subnet was not found as this warning is
already issued elsewhere.

% seems to (possibly) cause an unexpected side effect in an SQL statement.

Conflicts:
	ChangeLog