* Check blocked ovn-chassis units with bad config
LP bug#1919481 [0] needs to have a func-test to check if units can
handle bad bridge-interface-mappings configuration and set units
workload to block state and return to active state with good config.
[0] https://bugs.launchpad.net/charm-ovn-chassis/+bug/1919481
* Changing test_wrong_bridge_config to use config_change
Instead of using block_until_unit_wl_status, change the test_config
to be able to check blocked state for ovn-chassis units
Co-authored-by: Aurelien Lourot <aurelien.lourot@canonical.com>
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