* got single node working; refining error messaging and version info to follow
* better implementation that separates the build condition into etcd/enterprise_cluster.go and etcd/plg_cluster.go. go build will default to a clustering version and 'go build -tags plg' will build the non-clustering version
* added Makefile target for 'make plg'
* additional comments, CI/CD update
Co-authored-by: Kasey Rodgers <kaseyrodgers@Kaseys-MBP.attlocal.net>
