chore(core): do not expect default DockerCmdExecFactory service

chore(core): do not expect default DockerCmdExecFactory service · docker-java/docker-java@74caed5

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Original file line number	Diff line number	Diff line change
`@@ -16,12 +16,9 @@ public class DockerClientBuilder {`
`16`	`16`	`static {`
`17`	`17`	`serviceLoader.reload();`
`18`	`18`	`Iterator<DockerCmdExecFactory> iterator = serviceLoader.iterator();`
`19`		`-if (!iterator.hasNext()) {`
`20`		`-throw new RuntimeException("Fatal: Can't find any implementation of '"`
`21`		`- + DockerCmdExecFactory.class.getName() + "' in the current classpath.");`
	`19`	`+if (iterator.hasNext()) {`
	`20`	`+factoryClass = iterator.next().getClass();`
`22`	`21`	`}`
`23`		`-`
`24`		`-factoryClass = iterator.next().getClass();`
`25`	`22`	`}`
`26`	`23`
`27`	`24`	`private DockerClientImpl dockerClient = null;`
`@@ -49,6 +46,11 @@ public static DockerClientBuilder getInstance(String serverUrl) {`
`49`	`46`	`}`
`50`	`47`
`51`	`48`	`public static DockerCmdExecFactory getDefaultDockerCmdExecFactory() {`
	`49`	`+if (factoryClass == null) {`
	`50`	`+throw new RuntimeException("Fatal: Can't find any implementation of '"`
	`51`	`+ + DockerCmdExecFactory.class.getName() + "' in the current classpath.");`
	`52`	`+ }`
	`53`	`+`
`52`	`54`	`try {`
`53`	`55`	`return factoryClass.newInstance();`
`54`	`56`	`} catch (InstantiationException \| IllegalAccessException e) {`