Make `$InputTCPMaxSessions` configurable #242

Job	Run time
lint-unit / cookstyle	31s
lint-unit / check-metadata	5s
lint-unit / markdown-link-check	34s
lint-unit / markdownlint-cli2	3s
lint-unit / rspec	39s
lint-unit / yamllint	13s
integration	0s
	2m 5s

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