* Implement state='dist-upgrade'
Implements `zypper dist-upgrade` for the zypper module. This follows
how `zypper upgrade` is invoked, except `state='dist-upgrade'`.
Setting name to anything other than '*' would cause the module to error
out. `dist-upgrade` affects all packages and would not make sense to
apply to a specific package.
* Implement option extra_args
Add option to append additional arguments to zypper command. This
should be able to accommodate other options that are not (yet) covered
by zypper module.
Arguments are given as if written in the command line, complete with
dashes.
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