Adds missing statsd counter increment.

It seems that the counter for 'zuul.pipeline.<build name>.all_jobs' was
removed unintentionally, as part of features introduced on
b2332081d8e0fda780bbc1f4dfd917f2546d1724

This changes reintroduce the counter increment on that key.

Co-Authored-By: Danilo Ramalho <dramalho@thoughtworks.com>
Change-Id: I52f5aab5fb42b60c9af29c6ce312c3d04b883a02
1 file changed