Added task to install pip3 to adress the airhsip-shipyard zuul gate issue
where airship-shipyard-airskiff-deployment job fails on:
sudo -H -E pip install 'cmd2<=0.8.7'
sudo: pip: command not found
Updated pip to pip3 to move tom pip to pip3.
Also, updated the openstack-helm-infra commit-id to the latest to use
pip3 instead of pip.
Change-Id: I0d4aef4de3c10a9317acad8c8c9e17e15b309172
64c7d012b1