core/trivial: rename "source" field of addresses and routes
The "source" field of NMPlatformIPRoute (now "rt_source") maps to the protocol field of the route. The source of NMPlatformIPAddress (now "addr_source") has no direct equivalent in the kernel. As their use is different, they should have different names. Also, the name "source" is used all over the place. Hence give the fields a more distinct name.
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