labels plugin: fix it. and extend to cli/daemon.

plugins/labels/cmdline.py

@@ -0,0 +1,11 @@
+from .labels import LabelsPlugin
+from electrum.plugins import hook
+
+class Plugin(LabelsPlugin):
+
+    @hook
+    def load_wallet(self, wallet, window):
+        self.start_wallet(wallet)
+
+    def on_pulled(self, wallet):
+        self.print_error('labels pulled from server')