NGSTACK-805: load default Messenger configuration automatically #44

Job	Run time
8.1 unit	28s
8.1 integration legacy	46s
8.1 integration solr 7.7.3 single	1m 41s
8.1 integration solr 7.7.3 dedicated	1m 20s
8.1 integration solr 7.7.3 shared	2m 30s
8.1 integration solr 7.7.3 cloud	2m 41s
8.1 integration solr 7.7.3 regression single	13m 7s
8.1 integration solr 7.7.3 regression dedicated	14m 17s
8.1 integration solr 7.7.3 regression shared	15m 13s
8.1 integration solr 7.7.3 regression cloud	15m 12s
8.1 integration solr 8.11.2 single	2m 8s
8.1 integration solr 8.11.2 dedicated	1m 44s
8.1 integration solr 8.11.2 shared	2m 42s
8.1 integration solr 8.11.2 cloud	2m 38s
8.1 integration solr 8.11.2 regression single	14m 5s
8.1 integration solr 8.11.2 regression dedicated	14m 45s
8.1 integration solr 8.11.2 regression shared	20m 59s
8.1 integration solr 8.11.2 regression cloud	15m 40s
	2h 21m 56s

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