lime-config: generate configs from scratch

[p4u]

Copy from @dangowrt on lime-dev mailing list:

lime-config currently re-writes UCI configuration. ie. if I mess up /etc/config/network, running lime-config will not necessarily fix it. There are also situations which make re-running lime-config impossible as that would break the config completely.

To resolve that mess I suggest to refrain from re-writing UCI configuration and rather generate it from scratch every time by using the new /bin/config_generate script.

If anything is missing in that new board-config aka. uci-defaults approach, then we should add it and discuss with upstream, ie. make sure that all board-specific details needed to generate the entire configuration are covered.

[ilario]

Is the closing of #267 by #270 affecting this also? @G10h4ck @p4u

[ilario]

This would be good to have, so that fragments of old configurations would be wiped out :D
Sounds related to #135

[gmarcos87]

#135 was closed a few days ago, does that mean this can also be closed or is it still a problem?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[ilario]

@spiccinini could you give your opinion on this issue? Is this something that would help us? If I recall correctly from some discussion on #631, there was an easy way to do this, no?