Skip writing client config if it is not writable #952
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In some cases, the config file may be read-only. Since it is not
imperative that it be written (everything continues to work, it just
will not remember this device ID after a restart), just skip writing.
Ideally static and dynamic configuration should be totally separated,
however that is more complicated to implement and this is a quick fix.
Partial workaround for #579.