Updates for pmm2 agent script for upgrade issues #340

Job	Run time
bats-testsuite / cli-tests (ps5.7)	3m 49s
bats-testsuite / cli-tests (ps8)	4m 13s
bats-testsuite / cli-tests (ms8.0)	6m 10s
bats-testsuite / cli-tests (pdpgsql13)	3m 38s
bats-testsuite / cli-tests (pdpgsql14)	3m 39s
bats-testsuite / cli-tests (pdpgsql15)	3m 34s
bats-testsuite / cli-tests (modb4.4)	5m 29s
bats-testsuite / cli-tests (modb5)	5m 7s
bats-testsuite / cli-tests (modb6)	5m 8s
bats-testsuite / cli-tests (help)	2m 15s
bats-testsuite / cli-tests (generic)	3m 11s
bats-testsuite / cli-tests (server-container)	3m 9s
bats-testsuite / cli-tests (clientContainer)	5m 7s
bats-testsuite / cli-tests (haproxy)	6m 3s
bats-testsuite / cli-tests (proxysql)	5m 55s
bats-testsuite / cli-tests (remove)	3m 22s
	1h 9m 49s

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