MFC: 278841
MFC: 278841

sfxge: flush all Tx queues from if_qflush

Sponsored by:   Solarflare Communications, Inc.
Approved by:    gnn (mentor), glebius

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase