rstream: Use rsocket option to set route directly

rstream: Use rsocket option to set route directly

If we're using GID addressing, rdma_getaddrinfo can return
routing data directly.  Add an option for the user to
indicate that rdma_getaddrinfo should be called in place of
getaddrinfo.  And if routing data is available, call
rsetsockopt to set the route.

This helps test rsockets when ibacm and AF_IB support are
available.

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