[Commotion-admin] [luci-commotion] Dns override (#109)

[areynold]

Addresses #33 

Users should be able to override profile dns entries.
To test:
1. Select Commotion > Mesh Configuration (manual) from the top menu
2. Add two ip addresses in the DNS Servers field and save & apply. When the page reloads, the field should contain both ip addresses, and changes should appear in /etc/config/network on all interfaces using proto commotion.
3. Delete the ip addresses from the DNS Servers field in meshconfig. The dns entry should be removed from all interfaces in /etc/config/network with proto commotion.
4. Enter an invalid (non-ip address) string. The changes should be rejected.
You can merge this Pull Request by running:

  git pull https://github.com/opentechinstitute/luci-commotion dns-override

Or you can view, comment on it, or merge it online at:

  https://github.com/opentechinstitute/luci-commotion/pull/109

-- Commit Summary --

  * Deleted .swp and gedit backup files
  * Working placeholder population from /etc/config/network
  * Successful validation using host datatype
  * DNS form field should only show unique entries
  * Use .default, not .placeholder so overrides aren't accidentally deleted when editing other sections

-- File Changes --

    D luasrc/controller/commotion/.meshprofile.lua.swp (0)
    D luasrc/controller/commotion/meshprofile.lua~ (347)
    M luasrc/model/cbi/commotion/meshconfig.lua (69)

-- Patch Links --

https://github.com/opentechinstitute/luci-commotion/pull/109.patch
https://github.com/opentechinstitute/luci-commotion/pull/109.diff
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