mongo_wire: Too harsh tests removed from _packet_get_header and _data.
mongo_wire: Too harsh tests removed from _packet_get_header and _data.

There was a test in mongo_wire_packet_get_header and in _data() which
checked a value that we shouldn't have, thus resulting in weird
results.

algernon/libmongo-client,algernon/libmongo-client,algernon/libmongo-client