CI for MySQL Tuner for MySQL 5.7 and 8.0

Only pass `-P` for socket connection when port option is specified #135

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Run time

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Job	Run time
test_help (5.7)	55s
test_help (8)	48s
test_with_empty_db (5.7)	1m 38s
test_with_empty_db (8)	59s
	4m 20s