This uses the python3-pip package for Fedora but maintains the status
quo for existing distributions (i.e. for Suse we run get-pip.py but
don't uninstall, and for everything else we uninstall python3-pip and
run get-pip.py to be running the latest pip).
As noted inline, installing get-pip.py over Fedora 34's package no
longer works, and likely won't ever work again. Unlike the LTS
distributions, the Fedora pip should be more up-to-date, so I think
it's best we just avoid any package overwrites.
Change-Id: I84129aadfcf585bb150a3daa39616246d3d84bbd
a20971850a