[ROCKETMQ-283] add check for preventing update brokerName

• Type: Improvement
• Status: Closed
• Priority: Critical
• Resolution: Incomplete
• Affects Version/s: 4.0.0-incubating, 4.1.0-incubating
• Fix Version/s: 4.2.0
• Component/s: rocketmq-broker
• Assignee: Xinyu Zhou
• Reporter: yubaofu
• Created: 28/Aug/17 11:24
• Updated: 13/Dec/17 11:04
• Resolved: 13/Dec/17 11:04