Add more wireless options to network model

[jcronenberg]

Problem

For the migration there are a few wireless options that yast2lan has that are missing in agama.

Solution

Add the missing options.

Testing

• Added new unit tests
• Tested manually
• Tested with the migration: Wireless migration jcronenberg/agama#69

[coveralls]

coverage: 74.664% (+0.008%) from 74.656%
when pulling 2489a9a on jcronenberg:more_wireless_options
into df521d7 on openSUSE:master.

[imobachgs]

perhaps we should use a OwnedNestedHash or just use a String as key.

Suggested change

	// lifetimes are fun
	// FIXME: lifetimes are fun

[imobachgs]

Sorry for being so picky, but I would use WEPKeyType just for consistency reasons (we have used WPA and WEP in other places).

[imobachgs]

I usually find using combinators more readable, but I guess it is a matter of taste (I am used to them in other languages):

let auth_alg = security
    .get("auth-alg")
    .and_then(|alg| WepAuthAlg::try_from(alg.downcast_ref()?).ok())
    .unwrap_or_default();

And the same for the index:

let wep_key_index = security
    .get("wep-tx-keyidx")
    .and_then(|idx| idx.downcast_ref::<u32>().cloned())
    .unwrap_or_default();

And I guess you would follow a similar approach above if you move the complex part (the match) to a separate function.

But feel free to ignore these suggestions.

[imobachgs]

Please, add a changes entry.