apply_network_config improvements

3 things here:
 a.) do not raise exception, only warn when trying to apply a network 
     config for a distro that does not have an implementation.
     This is important since debian/ubuntu is the only one *with* an 
     implementation at the moment
 b.) apply network config in 'cloud-init --local' even if there is
     no datasource found.
 c.) do not write 70-persistent-net.rules 
     the code was writing both 70-persistent-net.rules and
     /etc/systemd/network/50-cloud-init-*.link files
     that would just be confusing.

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