Add embeded libregrah/idm server

This add a new service "idm" providing and LDAP service (via ldaps) on
port 9235.  If not existing it will bootstrap an initial LDAP tree and
administrative user as well as a self-signed Certificate and Key
(similar to what is done for glauth).

idm/pkg/command/version.go

@@ -0,0 +1,19 @@
+package command
+
+import (
+	"github.com/owncloud/ocis/idm/pkg/config"
+	"github.com/urfave/cli/v2"
+)
+
+// Version prints the service versions of all running instances.
+func Version(cfg *config.Config) *cli.Command {
+	return &cli.Command{
+		Name:     "version",
+		Usage:    "print the version of this binary and the running extension instances",
+		Category: "info",
+		Action: func(c *cli.Context) error {
+			// not implemented
+			return nil
+		},
+	}
+}