Merge PR #3426: Various changes to version cmd, revert those which previously broke ABI

* version prints out short info by default

Handle -o json, add --long flag to print full version info.

* Add distclean target to Makefile

* Update PENDING.md

* Add missing targets in .PHONY

client/rpc/root.go

@@ -26,7 +26,7 @@ func RegisterRoutes(cliCtx context.CLIContext, r *mux.Router) {
 // cli version REST handler endpoint
 func CLIVersionRequestHandler(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
-	w.Write([]byte(fmt.Sprintf("{\"version\": \"%s\"}", version.GetVersion())))
+	w.Write([]byte(fmt.Sprintf("{\"version\": \"%s\"}", version.Version)))
 }
 
 // connected node version REST handler endpoint