Monty Taylor a08002fd44
Install yarn if needed in javascript jobs
Some javascript projects use yarn for dependencies instead of raw npm.
If a yarn.lock file is detected in the zuul_work_dir, install yarn and
use yarn to install dependencies.

Needed-By: I5864e1b2f9952fbc35b08ebdef348c4917564c37
Change-Id: I9ae7dd3b33b2b607c1c5a17632e2aeb12e339d15
2017-12-14 10:08:22 -06:00
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