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see http://bind10.isc.org/ticket/1784#comment:5

thanks to the introduction of DNSServiceBase we don't need it any more.

also introduce mock DNSService and use it to test the behavior, and to test
the resolver behavior doesn't change.

the essential part should be quite simple; most of the changes are
straightforward interface adjustments.
it also includes some editorial cleanups such as adding header-file guards
or style guideline fixes.

Only some part of portconfig need to be adjusted; others will still use
the derived class directly.

"UDPVersion" is now more generic options, and its default is the previous
behavior, which should be more suitable default.  added test cases to
confirm the effect of the options.  added detailed documentation.

That matches the sense of YAGNI, and, in fact, would help avoid having the
type of regression we had in #1600.

also fixed memory leak in a test case using scoped_ptr.

take potential second boundary into account
also fixed a few long lines

We can no longer EXPECT_THROW, if we don't throw.

suboptimal solution instead.

okayed by muks on jabber.

It will make it less susceptible to assignment collisions.

also added a new unittest case to confirm this.  This change should also fix
failure in the NSEC3 lettuce test.

Use AM_ macros for makefile-specific options.  (Use of COMMON_
variables provoked a warning on some variants of autotools.)

1. Enclose death tests within suitable #ifdef for systems that don't
   support them.
2. Minor comment changes.

it.

since we don't have to preserve the existing item in this context, we can
simply swap the current vector with a newly created (with a reserved space)
vector.