add timeout on matrix connection and related errors handling

[flefebvre03]

Description

Fixes #1750

Status

READY

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Attempted connection to non-existent matrix server, checked that an error is logged, and that no exception are raised

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[FabioRosado]

Hello thank you for working on this fix and opening the PR!

I've added some comments but they are non blocking for this PR so I'm approving it

[codecov]

Codecov Report

Patch coverage: 33.33% and project coverage change: -0.08 ⚠️

Comparison is base (a44389a) 99.16% compared to head (edb461c) 99.09%.

❗ Current head edb461c differs from pull request most recent head 958bc5f. Consider uploading reports for the commit 958bc5f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1984      +/-   ##
==========================================
- Coverage   99.16%   99.09%   -0.08%     
==========================================
  Files          83       83              
  Lines        5395     5400       +5     
==========================================
+ Hits         5350     5351       +1     
- Misses         45       49       +4     

Impacted Files	Coverage Δ
opsdroid/connector/matrix/connector.py	97.36% <33.33%> (-1.15%)	⬇️

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[flefebvre03]

I believe it's ready to be merged.
Is there anything else I have to do?

[Cadair]

I think this is incomplete, you don't seem to use the timeout or the retry?

[jacobtomlinson]

Sorry we never got this over the line. Given the age of this PR I'm going to close it out.