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just for silencing some compilers.  in our usage this doesn't matter
in practice.  committing at my discretion.

Conflicts:
	src/bin/dhcp6/tests/config_parser_unittest.cc

the previous code doesn't seem to be understandable as I thought, so I
simplfy revert to the more straightforward way.
also added doc for the enum

The previous code should actually be safe based on the iostream/streambuf
APIs, but it's even much safer to completely give the ownership of the
passed stream to the input source.

they don't have to be (actually they already aren't) visible outside this
translation unit.

This should fix compilation, where it complains:

rrttl_unittest.cc:79: warning: this decimal constant is unsigned only in ISO C90

Conflicts:
	doc/devel/mainpage.dox
	src/lib/dhcp/Makefile.am
	src/lib/dhcp/lease_mgr.cc
	src/lib/dhcp/lease_mgr.h
	src/lib/dhcp/tests/Makefile.am
	src/lib/dhcp/tests/lease_mgr_unittest.cc

A number of other files were modified to resolve incompatibilities
in the way lease managers were created, and to promote the dummy
"memfile" lease manager to a fully-fledged lease manager with
unit tests.

There was a gap when one thing could overflow to negative numbers.

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.

Also, simplify the code little bit and make it run faster in the case of
TTL without any units.

Should fail at this time