network: try to guess operator name from MCCMNC or SID
When the network doesn't provide a valid text string with the current operator name, try to guess it using either the 3GPP MCCMNC pair or with the CDMA SID. Guessing is based on the Mobile Providers Database for which there is an API in libnm-gtk (>= 0.9.7.995). The same logic to guess operator name is used in gnome-shell.
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