data_updater: serialize MessageTracker and DataUpdater.Server starts

[rbino]

Avoid stalling a Data Updater when it is started through an RPC call instead of
being started by AMQPDataConsumer.

Fix #375

Signed-off-by: Riccardo Binetti riccardo.binetti@ispirata.com

[codecov]

Codecov Report

Merging #377 into release-0.11 will decrease coverage by 0.55%.
The diff coverage is 100.00%.

@@               Coverage Diff                @@
##           release-0.11     #377      +/-   ##
================================================
- Coverage         68.05%   67.50%   -0.56%     
================================================
  Files               238      205      -33     
  Lines              4931     4739     -192     
================================================
- Hits               3356     3199     -157     
+ Misses             1575     1540      -35     

Impacted Files	Coverage Δ
...astarte_data_updater_plant/consumers_supervisor.ex	100.00% <ø> (ø)
...b/astarte_data_updater_plant/amqp_data_consumer.ex	28.75% <100.00%> (+13.82%)	⬆️
...ata_updater_plant/amqp_data_consumer/supervisor.ex	100.00% <100.00%> (ø)
...ter_plant/lib/astarte_data_updater_plant/config.ex	90.00% <100.00%> (+1.11%)	⬆️
...ant/lib/astarte_data_updater_plant/data_updater.ex	91.83% <100.00%> (+0.72%)	⬆️
...e_pairing_api/agent/device_registration_request.ex
...e_pairing_api_web/views/credentials_status_view.ex
...astarte_pairing_api/lib/astarte_pairing_api_web.ex
...e_pairing_api/lib/astarte_pairing_api/auth/auth.ex
...i/lib/astarte_pairing_api_web/views/health_view.ex
... and 28 more

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