Meta image version bigger than bdb log version

[gengjun-git]

Describe the bug
如果bdb出现选主错乱的情况：有一个节点是master，但是另外两个都感知不到master，也收不到bdb的log。master节点每隔10s会打一个timestamp的log，所以master节点的log号会一直增加，在做image checkpoint的时候，master会把最新的image推送给另外两个fe，此时在另外两个fe中就会出现image的log号比dbd中的log号要大的情况。
此时如果用另外两个fe做元数据恢复，就会出现元数据操作重启失效的现象，因为bdb的log版本号比image的版本号小。

To Reproduce
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Expected behavior
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
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• Version [e.g. 22]

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