fix non exisitng eoan and add 21.04 and 21.10 versions

nkowenski requested to merge nkowenski/ctf-vm:master into master

for some reason eoan box is 404. replaced this one with 21.04 and added 21.10 versions founded at

➜  ~ uname -a
Linux ubuntu-impish 5.13.0-19-generic #19-Ubuntu SMP Thu Oct 7 21:58:00 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

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