Updates for pmm2 agent script for upgrade issues #324

Job	Run time
bats-testsuite / cli-tests (ps5.7)	3m 50s
bats-testsuite / cli-tests (ps8)	4m 23s
bats-testsuite / cli-tests (ms8.0)	6m 39s
bats-testsuite / cli-tests (pdpgsql13)	4m 38s
bats-testsuite / cli-tests (pdpgsql14)	4m 20s
bats-testsuite / cli-tests (pdpgsql15)	4m 5s
bats-testsuite / cli-tests (modb4.4)	5m 35s
bats-testsuite / cli-tests (modb5)	5m 51s
bats-testsuite / cli-tests (modb6)	6m 3s
bats-testsuite / cli-tests (help)	3m 0s
bats-testsuite / cli-tests (generic)	3m 27s
bats-testsuite / cli-tests (server-container)	3m 40s
bats-testsuite / cli-tests (clientContainer)	5m 35s
bats-testsuite / cli-tests (haproxy)	6m 11s
bats-testsuite / cli-tests (proxysql)	6m 29s
bats-testsuite / cli-tests (remove)	3m 36s
	1h 17m 22s

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