Clark Boylan 6570eda366 Use pip3 to install zuul on executors
The executors aren't using docker container images yet due to conflicts
with bubblewrap. This means we are still installing it directly on the
host using pip. Unfortunately we were using `pip` before which maybe
install to python2 and zuul doesn't run under python2. Address this by
explicitly using pip3.

Change-Id: I2ec551e8207e29ca420b09b8818154b9c32b47cf
2020-04-24 18:15:31 -07:00
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