agentwrapper: Bump SSH timeout

[JoshuaWatt]

Bumps the SSH connection timeout to 30 seconds for the agent wrapper to match the other SSH timeouts

Checklist

• [ ] Documentation for the feature
• [ ] Tests for the feature

• [ ] The arguments and description in doc/configuration.rst have been updated

• [ ] Add a section on how to use the feature to doc/usage.rst

• [ ] Add a section on how to use the feature to doc/development.rst

• [ ] CHANGES.rst has been updated

• [x] PR has been tested

• [ ] Man pages have been regenerated

[codecov[bot]]

Codecov Report

Merging #954 (a4be000) into master (dffc61d) will not change coverage. The diff coverage is 100.0%.

@@          Coverage Diff           @@
##           master    #954   +/-   ##
======================================
  Coverage    57.1%   57.1%           
======================================
  Files         150     150           
  Lines       11199   11199           
======================================
  Hits         6402    6402           
  Misses       4797    4797           

Impacted Files	Coverage Δ
labgrid/util/agentwrapper.py	96.5% <100.0%> (ø)

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[jluebbe]

The idea behind the lower timeout for the agent was that the exporter must already be running at this point and that the network connection to an exporter should be reliable.

Did you run into the 5 second timeout?

[JoshuaWatt]

Yes. Due to many factors, we need a longer delay when connecting to the exporters (internal networking, multiple places per exporter, etc.). The 30 seconds on the normal connection timeout appears to be sufficient, although ideally it would be globally adjustable which I'm working on proposal to do that which I'll submit as a PR soon.

[JoshuaWatt]

#958 effectively does the same thing, but is my attempt to make it globally controlled. If you would prefer submitting that instead, that is fine with me

[JoshuaWatt]

Superseded by #958