[backend] Device network interfaces

[szakhlypa]

Fetch NetworkInterfaceProperties data from AppEngine and expose it via GraphQL

[coveralls]

Pull Request Test Coverage Report for Build 7c111bb0149d4be4e802a5e749e00837c5894795-PR-231

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+80.2%) to 80.242%

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Totals
Change from base Build 3619909826:	80.2%
Covered Lines:	861
Relevant Lines:	1073

---

💛 - Coveralls

[rbino]

Please add a changelog entry

[coveralls]

Pull Request Test Coverage Report for Build 7c111bb0149d4be4e802a5e749e00837c5894795-PR-231

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+80.2%) to 80.242%

---

Totals
Change from base Build 3619909826:	80.2%
Covered Lines:	861
Relevant Lines:	1073

---

💛 - Coveralls