Close gaps where append/completeblock file handles would rely on GC to close #570
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What this PR does:
This PR addresses a few instances where Append/CompleteBlock file handles would be left open and rely on GC to cleanup. The split of the deletion of WAL (AppendBlock) from creation of CompleteBlock also helps to ensure that AppendBlock.Clear is called, closing all handles.
Which issue(s) this PR fixes:
Fixes #569
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]