Failure Of SIGN, ACCEPT Stages

Under situation:  

• Suffrage group members should vote for SIGN stage.
• But some nodes in acting suffrage group does not offer the SIGN ballot.
• Timed out in a given time, each node fails to get enough ballots for SIGN stage.

Expected actions:  

• Each node stops the current vote,
• Each node broadcasts next INIT ballots for next round.