core,clients: use our own string hashing function nm_str_hash()
Replace the usage of g_str_hash() with our own nm_str_hash(). GLib's g_str_hash() uses djb2 hashing function, just like we do at the moment. The only difference is, that we use a diffrent seed value. Note, that we initialize the hash seed with random data (by calling getrandom() or reading /dev/urandom). That is a change compared to before. This change of the hashing function and accessing the random pool might be undesired for libnm/libnm-core. Hence, the change is not done there as it possibly changes behavior for public API. Maybe we should do that later though. At this point, there isn't much of a change. This patch becomes interesting, if we decide to use a different hashing algorithm.
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