Fix misbehavior of validator's unstaking, eg: issue 197. #206
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Fix the issue.
This problem arised because the code use a random state to generate a random publick key for undelegation, but it always generate a same key.
make sure that you have executed all the following process and no errors occur
The major changes of this PR
A new "random" public key generation.
Clean paid delegation completely.
Add a height to fix this.