Wait for node discovery in test_generate_policy.

[hidmic]

Replacement for #260. Only wait when daemon is in use (if not, CLI will use a different node).

CI up to sros2:

• Linux
• Linux-aarch64
• macOS
• Windows

[codecov]

Codecov Report

Merging #262 (75e4005) into master (ac0795c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #262   +/-   ##
=======================================
  Coverage   77.25%   77.25%           
=======================================
  Files          25       25           
  Lines         664      664           
  Branches       55       55           
=======================================
  Hits          513      513           
  Misses        131      131           
  Partials       20       20           

Flag	Coverage Δ
unittests	77.25% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../hfyv6abjie8/sros2/sros2/sros2/command/security.py
ros_ws/src/hfyv6abjie8/sros2/sros2/sros2/errors.py
...hfyv6abjie8/sros2/sros2/sros2/keystore/__init__.py
...fyv6abjie8/sros2/sros2/sros2/keystore/_keystore.py
...v6abjie8/sros2/sros2/sros2/verb/generate_policy.py
...v6abjie8/sros2/sros2/sros2/keystore/_permission.py
...yv6abjie8/sros2/sros2/sros2/verb/create_enclave.py
...jie8/sros2/sros2/sros2/policy/defaults/__init__.py
...src/hfyv6abjie8/sros2/sros2/sros2/verb/__init__.py
...c/hfyv6abjie8/sros2/sros2/sros2/policy/__init__.py
... and 40 more

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[hidmic]

@ros-pull-request-builder retest this please.

[clalancette]

This looks much better to me, thanks. And CI seems to be happy with it as well.

[hidmic]

Cool, thanks for the reviews! Does anybody have the bits to merge now? 😅

[clalancette]

@SidFaber If you get a chance, can you review/merge this?

[SidFaber]

LGTM, thank you!

[SidFaber]

@kyrofa or @mikaelarguedas can you merge?

[mikaelarguedas]

How was it tested that this addresses the issue ?
Can we confirm which test failure this is addressing ? which platform / architecture combination?

Looking at CI for this PR, it's not repeating any test so I'm not sure we can use that as reference to determine it reduces flakiness of a given test.

Comparing nightly CI referenced in the original issue:
https://ci.ros2.org/view/nightly/job/nightly_osx_repeated/lastCompletedBuild/testReport/sros2.test.sros2.commands.security.verbs/test_generate_policy/test_generate_policy/
And the one after this was merged:
https://ci.ros2.org/view/nightly/job/nightly_osx_repeated/2315/testReport/sros2.test.sros2.commands.security.verbs/test_generate_policy/test_generate_policy/

So maybe this PR did not have an effect ?