Retire f30 from fedoraInfraTox shared library

[siddharthvipul]

Fedora 30 has reached EOL, no use of keeping it by default. Users can always overwrite if they need it

cico-shared-library/vars/fedoraInfraTox.groovy

Line 3 in 836d64c

def call(ArrayList distros = ["f30", "f31", "f32", "latest"], Closure body) {