rsockets: Allow user to specify the QP sizes

rsockets: Allow user to specify the QP sizes

Add setsockopt options that allow the user to specify the desired
size of the underlying QP.  The provided sizes are used as the
maximum size when creating the QP.  The actual sizes of the QP
are the smaller of the user provided maximum and the maximum
sizes supported by the underlying hardware.

A user may retrieve the actual sizes of the QP through the
getsockopt call.

The send and receive queue sizes are specified separately.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>