KeyValueAction previously allowed only one key=>value pair to be
supplied in the CLI per argument.
While the operator could supply multiple key=>value pairs by repeatedly
using the same argument it was unnecessarily verbose and tedious approach.
Similar behavior is implemented in the tripleoclient validator CLI
by the resulution to the rhbz#1959492 [0].
Tests were adjusted.
[0]https://bugzilla.redhat.com/show_bug.cgi?id=1959492:
Signed-off-by: Jiri Podivin <jpodivin@redhat.com>
Change-Id: I28c40bb8156d73dd95af9641acaab3cce721be2d
5cad282b80