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- add brackets and braces in pools

The makefile already used kea for html.stylesheet so wasn't noticed
before.  This was reported to me off-list.

Perfdhcp can be used with option -l to specify the local address to be
used.

However, when this option is used on a secondary address of an
interface, this doesn't work correctly.

The packets are sent with:
- giaddr = adresse specified (correct)
- source ip address = the interface primary IP address

Here is a patch that correctly sets the source IP address before sending
the packet.
This allows to launch multiple perfdhcp processes at the same time,
sharing the same interface but each using a distinct IP address.

Conflicts:
	ChangeLog
	Makefile.am
	src/lib/dhcpsrv/daemon.cc

 - ChangeLog updated
 - applyDefaultConfiguration() removed
 - couple unit-tests renamed
 - comments added for code that uses TEST_DATA_TOPBUILDDIR
 - copyright years updated
 - one function moved: logger_unittest_support.cc => logger_support.cc

 - Logging section updated.
 - Missing coma in kea.conf.pre added
 - ${localstatedir}/log is now created

docs fixes

- add brackets and braces in pools

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