Tests

Make max read size configurable #909

Job	Run time
unit	4m 31s
e2e (TestMultipleChainHorcrux)	5m 29s
e2e (TestChainPureHorcrux)	5m 17s
e2e (TestDownedSigners2of3)	6m 38s
e2e (TestDownedSigners3of5)	8m 22s
e2e (TestLeaderElection2of3)	5m 34s
e2e (Test2Of3SignerThreeSentries)	5m 10s
e2e (Test2Of3SignerThreeSentriesUniqueConnection)	5m 8s
e2e (TestUpgradeValidatorToHorcrux)	5m 0s
e2e (TestSingleSignerTwoSentries)	4m 58s
e2e (TestHorcruxProxyGRPC)	5m 12s
	1h 1m 19s

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