simple: Some updates and addition of RDM RMA example.

1. Add machine readable output to RDM examples.
2. The server side should use source address in fi_getinfo if given by user.
    We need to pass FI_SOURCE flag for that.
3. Set FI_PROV_MR_ATTR bit in fi_info->mode if it is unset after fi_getinfo
   returns. This is needed to make the provider supply MR attributes.
4. Add an example for Reliable Datagram RMA usage.

Signed-off-by: Arun C Ilango <arun.ilango@intel.com>