Add a concurrent connections threshold configuration parameter #329

Job	Run time
Pharo64-10 + app-config	43s
Pharo64-10 + app-control	43s
Pharo64-10 + app-info	36s
Pharo64-10 + core	32s
Pharo64-10 + dependent-sunit-extensions	39s
Pharo64-10 + deployment	41s
Pharo64-10 + development	51s
Pharo64-10 + examples	47s
Pharo64-10 + healthcheck	39s
Pharo64-10 + json-rpc	37s
Pharo64-10 + loggers	56s
Pharo64-10 + metrics	41s
Pharo64-10 + metrics-http	37s
Pharo64-10 + tests	44s
Pharo64-10 + tools	34s
Pharo64-11 + app-config	46s
Pharo64-11 + app-control	45s
Pharo64-11 + app-info	28s
Pharo64-11 + core	33s
Pharo64-11 + dependent-sunit-extensions	37s
Pharo64-11 + deployment	34s
Pharo64-11 + development	53s
Pharo64-11 + examples	50s
Pharo64-11 + healthcheck	40s
Pharo64-11 + json-rpc	30s
Pharo64-11 + loggers	45s
Pharo64-11 + metrics	33s
Pharo64-11 + metrics-http	31s
Pharo64-11 + tests	43s
Pharo64-11 + tools	16s
	19m 44s

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