Add sleep on mongodb stop #107

Job	Run time
test (macos-latest, mongodb-4.4.10.sh)	28s
test (macos-latest, mongodb-5.0.3.sh)	33s
test (macos-latest, mysql-5.7.31.sh)	1m 7s
test (macos-latest, mysql-8.0.30.sh)	42s
test (macos-latest, postgresql-12.4.sh)	46s
test (macos-latest, postgresql-13.2.sh)	42s
test (macos-latest, redis-6.0.16.sh)	1m 13s
test (macos-latest, redis-6.2.6.sh)	1m 30s
test (ubuntu-latest, mongodb-4.4.10.sh)	20s
test (ubuntu-latest, mongodb-5.0.3.sh)	19s
test (ubuntu-latest, mysql-5.7.31.sh)	44s
test (ubuntu-latest, mysql-8.0.30.sh)	38s
test (ubuntu-latest, postgresql-12.4.sh)	4m 15s
test (ubuntu-latest, postgresql-13.2.sh)	4m 32s
test (ubuntu-latest, redis-6.0.16.sh)	1m 31s
test (ubuntu-latest, redis-6.2.6.sh)	2m 6s
	21m 26s

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