private static SshjSshClient getSSHClient(URL url, String privateKey) {
		return getSSHClient(url.getHost(), privateKey);
	}
Verifies the specified path exists on remote machine.
@param host The host where the file exists.
@param privateKey ssh private key credential
@param path path to file or directory
@return true if file exists else false.
spring-xd-integration-test/src/main/java/org/springframework/xd/integration/util/StreamUtils.java