GetHostnameOrIp converts hostname into ip and apply user if necessary.

Returns the command output, whether the exit was ok, and any errors TODO(random-liu): junitFilePrefix is not prefix actually, the file name is junit-junitFilePrefix.xml.

SSH executes ssh command with runSSHCommand as root.

SSHNoSudo executes ssh command with runSSHCommand as normal user.

WriteLog is a temporary function to make it possible to write log in the runner.

ConformanceRemote contains the specific functions in the node conformance test suite.

NodeE2ERemote contains the specific functions in the node e2e test suite.

TestSuite is the interface of a test suite, such as node e2e, node conformance, node soaking, cri validation etc.