[controller] Update hostname if provided by the client

[okraits]

Fixes #293

[TravisBuddy]

Travis tests have failed

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Please read the following log in order to understand the failure reason.
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./run-qa-checks

SUCCESS: Blank endline check successful!
SUCCESS: Migration name check on "./openwisp_controller/config/migrations" with migrations-to-ignore: 12 successful!
SUCCESS: Migration name check on "./openwisp_controller/connection/migrations" with migrations-to-ignore: 0 successful!
SUCCESS: Migration name check on "./openwisp_controller/geo/migrations" with migrations-to-ignore: 0 successful!
SUCCESS: Migration name check on "./openwisp_controller/pki/migrations" with migrations-to-ignore: 4 successful!
Skipped 1 files
SUCCESS: Isort check successful!
All done! ✨ 🍰 ✨
192 files would be left unchanged.
SUCCESS: Black check successful!
SUCCESS: Flake8 check successful!
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Checked commit message:


[controller] Update hostname if provided by the client

Fixes #293


ERROR: Commit message check failed!
No changes detected
SUCCESS: Migrations check successful!

TravisBuddy Request Identifier: 05251310-0d2c-11eb-9111-f326d0cb7f09

[coveralls]

Coverage remained the same at 99.288% when pulling b643d68 on TDT-AG:tdt-update-hostname into 53da00c on openwisp:master.