RDS: TCP transport support

Hello netdev,

This patch series adds a TCP transport for RDS. Instead of requiring
an IB queue pair for communication between two nodes, it may instead 
tunnel traffic over a TCP connection. This makes RDS usable by
people without IB hardware, or in a VM.

In addition, this patchset modularizes RDS into an rds core module,
an rds_rdma module (for Infiniband and iWARP) and rds_tcp module. RDS
itself no longer has a dependency on IB (the rds_rdma module does).

This code has been tested and verified to work and perform acceptably, 
but has not yet had intensive performance analysis.

Thanks -- Regards -- Andy


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