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

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.

SyncUDPServer by command.

the rest of code actually didn't need this directive, so the removal shouldn't
do any harm anyway.

It was introduced in #1599

default internal buffer or set the separate buffer by setBuffer().

It compiles, but has some problems in tests.

These methods are not used in the code at all. And they seem like
useless anyway.

Actually, the SyncUDPSocket is currently a copy of the UDPSocket. It
needs to get stripped little bit.

needed for some systems that have system headers that don't include headers that
define what they need.

The service is now (nonstatic) member and the static variable is only
pointer to the active one, so the signal handler can access it.

It eliminates the need to call commonSetup and makes it possible to
constify something.

Catch on the closing bracket, include little bit more in the try.

Just consistency and performance.

The time goes on and we are a year older already.

constify things; use DISABLE_ instead of comment out for the disabled test;
typo

assumption on the descriptors; added blank lines for readability.

The test passes on Linux with epoll, as the (invalid) file descriptor is
inserted right away. The others don't detect the error right at the
time, so it doesn't throw.