tests: rename local variables in NM test stub (1)
- don't use "hash" for a local variable in python. The editor highlights it like a special python name. - don't use "settings" for Connection.settings. Name it Connection.con_hash. The name "settings" is over-used already. "con_hash" really is the nested dictionary that we expose/receive from D-Bus. If we would use libnm for it, it would be an NMSimpleConnection instance, but we don't.
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