The majority of the other roles use "Install distro packages"
as the name for the package installation task. This patch renames the
task in the pip_install role to match.
This will help when we try to profile the CI jobs to see which tasks
are taking the longest time to complete.
Change-Id: I339744e25359b79914ec09259918e61d733f87e7
Signed-off-by: Major Hayden <major@mhtx.net>