* nxos_interfaces_ospf: fix passive-interface states & check_mode
This fix addresses issues #41704 and #45343.
The crux of the problem is that `passive-interface` should have been treated as a tri-state value instead of a boolean.
The `no` form of the command disables the passive state on an interface (allows it to form adjacencies and send routing updates). It's essentially an override for `passive-interface default` which enables passive state on all OSPF interfaces.\*
This `no` config will be present in `running-config`.
\**See `router ospf` configuration.*
Since both enable and disable states are explicit configs, the proper way to remove either of these is with the `default` syntax.
Passive-interface config syntax:
```
ip ospf passive-interface # enable (nvgens)
no ip ospf passive-interface # disable (nvgens)
default ip ospf passive-interface # default (removes config, does not nvgen)
```
Code changes:
* `passive_interface` param changed from boolean to string, restricted to `true`,`false`,`default`.
* Several passive-interface specific checks were added because the existing module logic tends to test for true or false and doesn't handle the None case.
* Fixed `check_mode`.
Sanity verified on: N9K,N7K,N3K,N6K
* Fix doc header
* Unit tests for passive-interface
* doc fix#2
* Fix indent for SA
* Remove 'default' keyword, restore bool behavior
* remove changes to sanity
20fb77c49b