Fix slow ssh

We break the read while loop after waiting "the end of the process" and
the pipes are empty, otherwise we do another select that waits all the
timeout.

lib/ansible/runner/connection_plugins/ssh.py

@@ -303,6 +303,9 @@ class Connection(object):
             # Calling wait while there are still pipes to read can cause a lock
             elif not rpipes and p.poll() == None:
                 p.wait()
+                # the process has finished and the pipes are empty,
+                # if we loop and do the select it waits all the timeout
+                break
         stdin.close() # close stdin after we read from stdout (see also issue #848)
         
         if C.HOST_KEY_CHECKING and not_in_host_file:

lib/ansible/runner/connection_plugins/ssh_old.py

@@ -261,6 +261,9 @@ class Connection(object):
             # Calling wait while there are still pipes to read can cause a lock
             elif not rpipes and p.poll() == None:
                 p.wait()
+                # the process has finished and the pipes are empty,
+                # if we loop and do the select it waits all the timeout
+                break
         stdin.close() # close stdin after we read from stdout (see also issue #848)
         
         if C.HOST_KEY_CHECKING and not_in_host_file: