fix: fix data loss

[ZhongChaoqiang]

What problem does this PR solve?

Data loss becase wrong init_durable_decree in .init-info file.
For details, see apache/incubator-pegasus#719

What is changed and how it works?

using last_durable_decree for init_durable_decree in .init-info file.

Check List

Tests

Manual test (add detailed scripts or steps below)

[zhangyifan27]

Could you add a test showing that this works the way you expect?

[ZhongChaoqiang]

@neverchanje @hycdong
Can you help to review the code?
Thanks!

[ZhongChaoqiang]

Could you add a test showing that this works the way you expect?

@zhangyifan27
OK，I will try to add a unit test. But this is a little complicated. Can you recommend a similar test case for me? Thanks!

[Smityz]

mentioned in apache/incubator-pegasus#719