Add a bkd-side optimization for 'bk havekeys -D' used by the urllist code.  This version init's the product cset file instead of every component cset file.
Add a bkd-side optimization for 'bk havekeys -D' used by the
urllist code.  This version init's the product cset file instead
of every component cset file.

bk: 4d777e01v5ZeOAdoLyn61h49_XvY5Q
bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper