Fix infinite timeouts in ovs-vsctl (Closes: #1000137)

[slyon]

Description

ovs-vsctl will hang forever if the host is not OVS enabled, blocking the tests. This can especially happen when running tests in a container where the host does not have OVS installed (e.g. ci.debian.net).

Checklist

• Runs make check successfully.
• Retains 100% code coverage (make check-coverage).
• New/changed keys in YAML format are documented.
• (Optional) Adds example YAML for new feature.
• (Optional) Closes an open bug in Debian: https://bugs.debian.org/1000137

[codecov-commenter]

Codecov Report

Merging #266 (a4ad684) into main (306600d) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #266   +/-   ##
=======================================
  Coverage   99.07%   99.07%           
=======================================
  Files          61       61           
  Lines       10864    10864           
=======================================
  Hits        10764    10764           
  Misses        100      100           

Impacted Files	Coverage Δ
tests/generator/base.py	100.00% <ø> (ø)
tests/generator/test_ovs.py	100.00% <ø> (ø)
src/openvswitch.c	100.00% <100.00%> (ø)

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[slyon]

Things are starting to look good again on ci.debian.net/packages/n/netplan.io with Debian package 0.103-4 which contains this changeset as a distro-patch.

[schopin-pro]

LGTM, merging!