WIP refactor and new classes to support the SDAM spec
SDAM some more work on the spec
SDAM move label method to topology description
SDAM move state changes to within description class methods
SDAM begin SS work
SDAM More SS, begin to connect to cluster implementation
SDAM add some error-handling logic
SDAM rename cluster types to topology types
SDAM topology description now does everything
more scanner work
get things compiling again
sdam_scanner tests
working node-switch
node_switch in cluster
SDAM basic functionality for topology description SS
SDAM plumbing for rudimentary server selection
added viable insert to node-switch
node_switch -> set
start on cluster