net: get missing config variables from config_2g3g

Don't ask the user to copy config_2g3g and manually keep it in sync with
config_2g3g with each change anymore. Instead, let the user config be a
diff on top of config_2g3g.

This is in preparation to adding new variables for use with OsmoBSCNAT.

Change-Id: I5870d39aee8be84c2024f8a2a71ee4a734a4fc7c
2 files changed