Add a change for killall to not unmount server and agent directory #7949

Job	Run time
build / Build	6m 25s
Integration Tests (certrotation)	1m 55s
Integration Tests (etcdrestore)	1m 39s
Integration Tests (localstorage)	1m 28s
Integration Tests (startup)	7m 27s
Integration Tests (custometcdargs)	39s
Integration Tests (etcdsnapshot)	7m 54s
Integration Tests (kubeflags)	7m 27s
Integration Tests (longhorn)	2m 29s
Integration Tests (secretsencryption)	2m 15s
Integration Tests (flannelnone)	1m 17s
	40m 55s

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