[VNIC] added support for ipv6 checksum offload.

[VNIC] added support for ipv6 checksum offload.
- fixed potential netpath null dereference
- fixed control path initialization potential flaw,
- simplified LBFO a bit and removed NdisMRemoveMiniport since
  it breaks adapter reset-reinitialization.
- removed cmd reset request (doesn't make sense when path is broken).
- hung flag set change
- debug messages, replace some macros with inline funcs, some code cleanup and formatting.
INF changes
 - fixed service name.
 - mtu payload size can be modified in 100 bytes increments( was 500).

git-svn-id: svn://openib.tc.cornell.edu/gen1@933 ad392aa1-c5ef-ae45-8dd8-e69d62a5ef86