WatchService : Anonymous new Runnable() can be replaced with lambda

[rohanKanojia]

Description

This anonymous class can be replaced with a lambda:

docker-maven-plugin/src/main/java/io/fabric8/maven/docker/service/WatchService.java

Lines 128 to 131 in fc53963

	return new Runnable() {
	@Override
	public void run() {
	List<AssemblyFiles.Entry> entries = files.getUpdatedEntriesAndRefresh();

Acceptance Criteria

• Replace anonymous class with lambda
• Use isEmpty() in place of size() > 0 check

[rohanKanojia]

@mdxabu Could you please review this one? Is it clear enough for you to pick?

[mdxabu]

@mdxabu Could you please review this one? Is it clear enough for you to pick?
yes, I can pick this

[alpha951]

If a PR has not been raised yet for this issue, could you please assign it to me? I've submitted a PR for the previous assignment #1782

[mdxabu]

If a PR has not been raised yet for this issue, could you please assign it to me? I've submitted a PR for the previous assignment #1782

Sorry, This issue was assigned for me, I am working on it.

[mdxabu]

Closed via #1783