Ports Cyris to Ubuntu 20.04 and Python 3, fixes several/potential bugs#7

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tdgunes wants to merge 3 commits intocrond-jaist:masterfrom tdgunes:master

+1,844-829

Commits on Jul 1, 2020

Initial commit, basic.yml is tested and works in Ubuntu 20.04
tdgunes
committed

Commits on Jul 2, 2020

Fix iptables forwarding multiport
tdgunes
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Commits on Jul 10, 2020

Remove unnecessary comments in vm_clone_xml.sh
tdgunes
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