There was an attempt to achieve this by customizing --version and
--release arguments for Lorax, but Pungi does not take the [general] and
[release] sections from its .treeinfo. Instead it was always using
release version.
The value from this new option will be put into .treeinfo and used for
--version and --release arguments in Lorax (unless explicitly defined in
lorax_options to another value).
JIRA: COMPOSE-4029
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>