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Now awaiting the merging of #2980 (the hooks code) so that the
configuration validation code can check if the libraries are valid
before accepting the configuration.

a simple-type parser. Replaces individual class definitions
for BooleanParser, Uint32Parser, and StringParser.  Base class
uses new ValueStore<> storage template class.

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

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.