[DAPL2] udapl/scm: convert error code into dapl error code

[DAPL2] udapl/scm: convert error code into dapl error code
Intel MPI checks the uDAPL error code when calling dat_psp_create() to see if
the port number that it provides is in use or not.  Convert winsock error codes
to unix errno values.

This fixes the following error reported by Intel MPI:
'DAPL provider is not found and fallback device is not enabled'

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
git-svn-id: svn://openib.tc.cornell.edu/gen1@2401 ad392aa1-c5ef-ae45-8dd8-e69d62a5ef86