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This is unrelated to #5330 but there was a good opportunity to do it.

This was a result of the review.

- Improved commentary, corrected commentary issues.
- Renamed class members in command_mgr_unittests.

Hopefully, that will make Thomas'es weekend nicer.

- Extended commentary
- Added exception safe ServerHooks::findIndex
- Extended unit tests of ServerHooks

    src/lib/hooks/callout_manager.cc

Added unit tests that check that configuration of various servers can
coexist.

This change fixes an unstable unit test and it was okayed on jabber.

    Merge branch 'trac5325' and added rules for files
    missed in asiolink:

src/lib/asiolink/Makefile.am
    +libkea_asiolink_la_SOURCES += io_acceptor.h
    +libkea_asiolink_la_SOURCES += unix_domain_socket_acceptor.h
    +libkea_asiolink_la_SOURCES += unix_domain_socket_endpoint.h

src/bin/d2/Makefile.am
    Added EXTRA_DIST rule for d2_parser.yy