Add a concurrent connections threshold configuration parameter #327

Job	Run time
Pharo64-10 + app-config	31s
Pharo64-10 + app-control	43s
Pharo64-10 + app-info	30s
Pharo64-10 + core	35s
Pharo64-10 + dependent-sunit-extensions	30s
Pharo64-10 + deployment	49s
Pharo64-10 + development	39s
Pharo64-10 + examples	40s
Pharo64-10 + healthcheck	30s
Pharo64-10 + json-rpc	32s
Pharo64-10 + loggers	46s
Pharo64-10 + metrics	40s
Pharo64-10 + metrics-http	40s
Pharo64-10 + tests	39s
Pharo64-10 + tools	29s
Pharo64-11 + app-config	47s
Pharo64-11 + app-control	37s
Pharo64-11 + app-info	31s
Pharo64-11 + core	29s
Pharo64-11 + dependent-sunit-extensions	34s
Pharo64-11 + deployment	33s
Pharo64-11 + development	38s
Pharo64-11 + examples	33s
Pharo64-11 + healthcheck	41s
Pharo64-11 + json-rpc	29s
Pharo64-11 + loggers	31s
Pharo64-11 + metrics	40s
Pharo64-11 + metrics-http	30s
Pharo64-11 + tests	57s
Pharo64-11 + tools	17s
	18m 0s

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