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

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.

Conflicts:
	ChangeLog

Conflicts:
	src/lib/dhcpsrv/configuration.h

Conflicts:
	ChangeLog

Conflicts:
	ChangeLog

This is trivial fix so as I am committing it on my own discretion. Also,
this fix had already been reviewed and applied on master branch but
apparently disappeared after the recent git migration.

Also, removed multiple references to DHCP4_CONFIG_LOAD_FAIL from the
DHCPv4 server and DHCP6_CONFIG_LOAD_FAIL from the DHCPv6 server.

(another test of git server migration :)

(This is a test of new git server :)

Conflicts:
	ChangeLog

Conflicts:
	ChangeLog