Fix support for multiple CA arguments

Tadej Novakrequested to merge
tadej/athena:ca-arg into master

Fix support for multiple CA arguments.

It seems there's a python limitation that in case of arguments with arbitrary number it's impossible to set the default value when argument is provided without values (i.e. --CA). I had to use actions which do the full parsing so I created argAction class and argActionFactory class.

/cc @nstyles @jcatmore @christos @mhodgkin

Edited by Tadej Novak

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