Varios updates to the README.md file:
* Corrected to use 'curl' rather than 'p4 print' to get the reset_sdp.sh
script, since the 'p4' won't exist on a vanilla CentOS/RHEL box.
* Updated to reflect modern SDP, using /hxdepots rather than /depotdata.
* Updated Project Status to note that support for Swarm and Git Fusion
have been deferred.