Part of big container framework update.
Podman is updated to version 2.2.1. It is built using master
branch of go, since building go1.15.x with gccgo fails.
Also contains fixes to build script, doinst.sh and slack-desc.
Please note that libpod.conf is superseeded by containers.conf.
Signed-off-by: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>
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