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The modifications to the staging configuration are performed on the pointer
returned by getCfgOptionDef.

This change affects many files using the Configuration object and types
derived from it.

Comments have been improved in one file.  The other contains a test
that alters logging, so a test fixture has been added that ressets
the logging back to the default in its destructor.

Some unit tests in dhcpsrv altered the logging configuration but
never reset it. That configuration was then used for subsequent
tests and made them overly verbose.

Previously, the logger configuration was applied (to log4cplus) as soon as
it was parsed. We decided in the jabber discussion that the logger
configuration should only be applied if the whole configuration goes
through. So, the logger configuration is now 2-stage: parsing and commit
as for other configuration parameters.

Also, added better documentation for the IfaceCfg class.

 - Daemon::getVersion() added
 - exists => exits in docs
 - fixed comment in dhcp_test_lib.sh.in

 - variables, test renamed in daemon unit-tests
 - verbose parameter documented in Daemon class

 - Kea ARM updated
 - shell tests for Kea4,Kea6 and D2 are now passing
 - kea.conf updated with logging info
 - Various improvements in Daemon and LogConfigParser
 - DEFAULT_SYSLOG_NAME removed
 - Copyright years fixed
 - Couple additional tests written