blockpool stability fixes:

- follow up locks and fix them
- chainManager: call SetQueued for parentErr future blocks, uncomment TD checks, unskip test
- make ErrIncorrectTD non-fatal to be forgiving to genuine mistaken nodes (temp) but demote them to guard against stuck best peers.
- add purging to bounded nodeCache (config nodeCacheSize)
- use nodeCache when creating blockpool entries and let non-best peers add blocks (performance boost)
- minor error in addError
- reduce idleBestPeerTimeout to 1 minute
- correct status counts and unskip status passing status test
- glogified logging

errs/errors_test.go

@@ -28,7 +28,7 @@ func testErrors() *Errors {
 func TestErrorMessage(t *testing.T) {
 	err := testErrors().New(0, "zero detail %v", "available")
 	message := fmt.Sprintf("%v", err)
-	exp := "[TEST] zero: zero detail available"
+	exp := "[TEST] ERROR: zero: zero detail available"
 	if message != exp {
 		t.Errorf("error message incorrect. expected %v, got %v", exp, message)
 	}