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The new hooks tests require two shared libraries, which were not generated
when static linking was used and caused tests to fail. This patch forces
generation of these shared libraries. Okayed on jabber.

This change provides a template "CalloutHandle store" for use in the
DHCP servers.  It replaces server-specific methods and adds the ability
to clear the stored pointers.

 - pkt6_receive, subnet6_select, lease6_select, pkt6_send
 - framework updated
 - some unittests implemented

dhcp_parsers_unittest.cc.  Added Element type checks to
Boolean and String parsers, corrected some commentary.

- detailedLeaseCompare unified (alloc_engine and mysql_lease_mgr)
- comments clarified

Also make the hardware address to string function common to both
database modules.

now receives settings via configure

discussed on jabber

Having duid.{h, cc} in libdhcp++ causes dependency between two libraries.
Due to this dependency multi-threaded build fails because libs are created
by different threads simultaneously and race condition occurs. Libraries
should be moved to separate folders and have separate makefiles. This
complies with BIND10 structure and will make this issue goe away.

The unit tests now create the schema before each test and destroy
it afterwards.  This will be more flexible than needing to update
the schema on test machines each time.  The drawback is the need
to keep the database creation script in step with the hardcoded
set of SQL statements in the test program.

Also includes first unit test, which fails.

Also move GTEST_LDADD to the bottom of the list of LDADDs.

Adding such comments was discussed and agreed on jabber with Jinmei.