fix(datastore): improve performances on messages store #1778

Job	Run time
Build	7m 4s
test-brokerAcl	17m 58s
test-tag	2m 13s
test-connection	14m 45s
test-accountAndTranslator	6m 13s
test-broker	27m 24s
test-datastore	15m 57s
test-device-management	12m 22s
test-device	5m 34s
test-jobEngineRestartOfflineDevice	10m 9s
test-jobEngineRestartOnlineDevice	13m 29s
test-jobEngineStartOfflineDevice	11m 0s
test-jobEngineStartOnlineDevice	13m 13s
test-jobEngineStepDefinitions	8m 5s
test-jobsAndScheduler	2m 37s
test-jobsIntegration	9m 41s
test-jobsIntegrationBase	9m 59s
test-security	5m 13s
test-user	3m 33s
test-userIntegration	8m 47s
test-userIntegrationBase	8m 17s
build-javadoc	10m 44s
junit-tests	8m 10s
test-deviceRegistry	9m 26s
test-endpoint	8m 14s
test-jobEngineRestartOnlineDeviceSecondPart	10m 20s
test-jobEngineServiceStop	13m 37s
test-RoleAndGroup	2m 35s
	4h 36m 39s

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