Updating the workload test to use the config file for the 'bgp_io_workload' and 'test' workload types. Loads the workload file for the bgp_io_workload type. Tests for remaining operations are to be added

The Bison code breaks in Bison 2.7 or newer.  We don't have any changes
planned for the parser itself in the near term, so this commit adds a
version of the parser generated with Bison 2.5 back to the repo for now.

tested with Bison 2.7.1 and Flex 2.5.35 (Ubuntu 13.10)

still need:
- test program
- shim layer logic (for reverse computation)
- example method