v1.0.0 — first release

Bump VERSION to 1.0.0 and cut the first tagged release of vpp-maglev.

Also in this commit:

- maglevc: MAGLEV_SERVER env var as an alternative to the --server
  flag, matching the MAGLEV_CONFIG / MAGLEV_GRPC_ADDR convention on
  the other binaries. The flag takes precedence when both are set.
- Rename cmd/maglevd -> cmd/server and cmd/maglevc -> cmd/client so
  the source directory names are decoupled from binary names (the
  frontend and tester commands already followed this convention).
  Build outputs and the Debian packages are unchanged.

cmd/client/main.go

@@ -24,10 +24,21 @@ func main() {
 }
 
 func run() error {
-	serverAddr := flag.String("server", "localhost:9090", "maglev server address")
+	defaultServer := "localhost:9090"
+	if v := os.Getenv("MAGLEV_SERVER"); v != "" {
+		defaultServer = v
+	}
+	serverAddr := flag.String("server", defaultServer, "maglev server address (env: MAGLEV_SERVER)")
 	color := flag.Bool("color", true, "colorize static labels in output (defaults to false in one-shot mode)")
+	printVersion := flag.Bool("version", false, "print version and exit")
 	flag.Parse()
 
+	if *printVersion {
+		fmt.Printf("maglevc %s (commit %s, built %s)\n",
+			buildinfo.Version(), buildinfo.Commit(), buildinfo.Date())
+		return nil
+	}
+
 	// Detect whether -color was explicitly set so we can pick a
 	// mode-aware default: color is useful in the interactive shell but
 	// noise (ANSI escapes) when piping one-shot output into scripts.