Multiple fixes/refactorings for ChainLocks#2765

Merged

UdjinM6 merged 11 commits intodashpay:developfrom

codablock:pr_llmq_chainlocks_enforce

Mar 13, 2019

Commits on Mar 12, 2019

Print which DKG type aborted
codablock
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Don't directly call EnforceBestChainLock and instead schedule the call
codablock
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Regularly call EnforceBestChainLock and reset error flags on locked chain
codablock
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Don't invalidate blocks from CChainLocksHandler::TrySignChainTip
codablock
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Only call ActivateBestChain when tip != best CL tip
codablock
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Fix unprotected access of bestChainLockBlockIndex and bail out if its null
codablock
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Fix ChainLocks tests after changes in enforcement handling
codablock
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Only invoke NotifyChainLock signal from EnforceBestChainLock
codablock
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Use a mutex to ensure that only one thread executes ActivateBestChain
codablock
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Commits on Mar 13, 2019