This patch adds configuration file support for a table of unicast
masters. Each table lives in its own section and has a unique,
positive numerical ID. Entries in the table are a pair of transport
type and protocol address.
Each port may specify a table id to be used for unicast negotiation.
Tables may not be shared between ports, but nothing prevents table
entries from appearing in more than table.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>