Add a change for killall to not unmount server and agent directory #267

Job	Run time
build / Build	6m 35s
Integration Tests (certrotation)	1m 55s
Integration Tests (etcdrestore)	2m 12s
Integration Tests (localstorage)	1m 45s
Integration Tests (startup)	7m 11s
Integration Tests (custometcdargs)	50s
Integration Tests (etcdsnapshot)	7m 30s
Integration Tests (kubeflags)	7m 23s
Integration Tests (longhorn)	2m 38s
Integration Tests (secretsencryption)	1m 54s
Integration Tests (flannelnone)	1m 30s
	41m 23s

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