Change 2959

John Fetkovich
Request Review
added dump method to lib/VCP/DB_File/ to dump keys => values
       from a sdbm file.  removed similar code from bin/dump_head_revs,
       bin/dump_rev_map and bin/dump_main_branch_id and called this method
       instead.  also made parse_files_and_revids_from_head_revs_db sub
       in TestUtils to use in test suites instead of
       parse_files_and_revids_from_p4_files et. al.
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