Expose wait_for_rsp class method via public classes.

In complicated uses of pyghmi, it becomes useful to call into the
otherwise private event loop iteration.  This exposes the
wait_for_rsp method so that it may be consumed without violating
the expectations of private.

Change-Id: Iee64615f0577b00895f8c3db25676c877107b0be

pyghmi/ipmi/command.py

@@ -98,6 +98,16 @@ class Command(object):
         while (session.Session.wait_for_rsp()):
             pass
 
+    @classmethod
+    def wait_for_rsp(cls, timeout):
+        """Delay for no longer than timeout for next response.
+
+        This acts like a sleep that exits on activity.
+
+        :param timeout: Maximum number of seconds before returning
+        """
+        return session.Session.wait_for_rsp(timeout=timeout)
+
     def get_bootdev(self):
         """Get current boot device override information.
 

pyghmi/ipmi/console.py

@@ -156,6 +156,16 @@ class Console(object):
         if not self.awaitingack:
             self._sendpendingoutput()
 
+    @classmethod
+    def wait_for_rsp(cls, timeout):
+        """Delay for no longer than timeout for next response.
+
+        This acts like a sleep that exits on activity.
+
+        :param timeout: Maximum number of seconds before returning
+        """
+        return session.Session.wait_for_rsp(timeout=timeout)
+
     def _sendpendingoutput(self):
         self.myseq += 1
         self.myseq &= 0xf