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of the common parser refactoring. Replaced individual global variables with
instance of new ParserContext class. Created new base classes PoolParser
and SubnetConfigParser.

configuration parsing classes into a common set of classes
in lib/dhcpsrv.  Moved most of the parsers classes into
new files dhcp_parsers.h/cc. Eliminated use of global
variables within common parsers.

mostly in documentation or in comments

reviewed by muks via jabber

includes output changes for two isc_throw.

template class ValueStorage in lib/dhcpsrv, dhcp4, and dhcp6.  Added unit
tests for new class in dhcpsrv/tests.

Also correct error messages in the configuration parser: the
same error is logged on any parser error, both creation and
running.  The text was made more general.

This overcomes the compilation failure on Sunstudio that is caused by the
boost::foreach_detail_::is_rvalue_() overloading ambiguity when
passing the rvalue to boost foreach.