MQTT: Fake "promise timeout" in MQTT tests to increase MQTT tests speed

[atrovato]

Fake "promise timeout" in mqtt tests.

[codecov]

Codecov Report

Base: 97.25% // Head: 97.26% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (3758144) compared to base (900b125).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1669   +/-   ##
=======================================
  Coverage   97.25%   97.26%           
=======================================
  Files         642      642           
  Lines        9671     9673    +2     
=======================================
+ Hits         9406     9408    +2     
  Misses        265      265           

Impacted Files	Coverage Δ
server/services/mqtt/lib/installContainer.js	97.22% <100.00%> (+0.16%)	⬆️

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[Pierre-Gilles]

Thanks for this PR!! It'll improve test speed, always good for the developer experience 😄

[relativeci]

Job #997: Bundle Size — 7.01MiB (0%).

6d7d3e8(current) vs 450cf1c master#996(baseline)

Metrics (1 change)

	Current Job #997	Baseline Job #996
Initial JS	3.03MiB	3.03MiB
Initial CSS	294.78KiB	294.78KiB
Cache Invalidation	0%	43.1%
Chunks	52	52
Assets	148	148
Modules	1258	1258
Duplicate Modules	2	2
Duplicate Code	0.03%	0.03%
Packages	111	111
Duplicate Packages	8	8

Total size by type (no changes)

	Current Job #997	Baseline Job #996
CSS	312.43KiB	312.43KiB
Fonts	93.55KiB	93.55KiB
HTML	13.58KiB	13.58KiB
IMG	1.64MiB	1.64MiB
JS	4.95MiB	4.95MiB
Media	0B	0B
Other	4.95KiB	4.95KiB

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