Shutdown the status thread as soon as clients complete (Issue #316)

[allanbank]

There are two commits.

The first has the actual fix which uses a CountDownLatch to notify the StatusThread when all of the clients have completed.

The second removes whitespace at the ends of lines and replaces tabs with 4 spaces.

[bigbes]

@allanbank as i suggest tabs must be 2 spaces: https://github.com/brianfrankcooper/YCSB/blob/master/checkstyle.xml#L161

[busbey]

If we get interrupted, we ought to return false instead of continuing to wait. (Presuming that will cause us to exit soon)

Should also set the thread's interrupted status.

[busbey]

Good catch @bigbes!

One other small nit, please update the commit messages to start with what they impact, in this case "[client]".

[allanbank]

I amended the commits.

[allanbank]

I merged in pr-#286's patch since the two pr's conflict.

[busbey]

can you amend the last commit to keep my authorship?

So long as it's the HEAD commit the command loolks like

 git commit --amend --author "Sean Busbey <busbey@apache.org>"

It'll open the commit message in your editor, just save and quit. You'll still show up as the committer when thing are in the repo. You'll have to force push the branch to update.

[allanbank]

done

[busbey]

👍