Retry SSH on ConnectionResetError (#708)

If a target host temporarily looses connection, for example upon
resetting a test VM as part of a parametrized test run, retry the SSH
connection the same way it is retried upon an SSH exception.

Signed-off-by: Georg Pfuetzenreuter <georg.pfuetzenreuter@suse.com>

Author: tacerus

testinfra/backend/paramiko.py

@@ -148,7 +148,7 @@ def run(self, command: str, *args: str, **kwargs: Any) -> base.CommandResult:
         cmd = self.encode(command)
         try:
             rc, stdout, stderr = self._exec_command(cmd)
-        except paramiko.ssh_exception.SSHException:
+        except (paramiko.ssh_exception.SSHException, ConnectionResetError):
             transport = self.client.get_transport()
             assert transport is not None
             if not transport.is_active():