tbreport related changes from Mike Kasick <mkasick@andrew.cmu.edu>:

- assign_wrapper2 now passes violations to the tbreport error parser.

- Fixed improper regexp in assign_wrapper2 tbreport error parser.

- Readded create_vlan_failed error in snmpit (left out of original commit
  for unknown reason).

- Modified endexp to use libtblog, added tbswap_out_failed error.