* Use separate data structure for IP configuration
So far we use the same IpConfig data structure to represent the users
IP setting and the currently applied IP configuration.
This commit separates the two in IpConfig (for the currently applied
IP configuration) and IpSetting (representing the user provided IP
setting).
* Use custom string constants for connection settings
Use separate string constants for all connection settings. This makes
it easier to search where a particular NetworkManager connection
setting is used.
* Use Python typing for IpAddress in IpProperties
* Address pytest issue
1ba621be60