Fix incorrect timing of the "RPC request sent" log. (#999)

Author: mhaoli

mobly/controllers/android_device_lib/snippet_client_v2.py

@@ -588,6 +588,7 @@ def _client_send(self, message):
     try:
       self._client.write(f'{message}\n'.encode('utf8'))
       self._client.flush()
+      self.log.debug('RPC request sent.')
     except socket.error as e:
       raise errors.Error(
           self._device,

mobly/snippet/client_base.py

@@ -289,7 +289,6 @@ def _rpc(self, rpc_func_name, *args, **kwargs):
 
       self.log.debug('Sending RPC request %s.', request)
       response = self.send_rpc_request(request)
-      self.log.debug('RPC request sent.')
 
       if self.verbose_logging or _MAX_RPC_RESP_LOGGING_LENGTH >= len(response):
         self.log.debug('Snippet received: %s', response)