Adds the third level commands for the log

[Voldivh]

🎉 New feature

This PR addresses the issue gazebosim/gz-tools#1 regarding adding the third-level flags for log command.

Summary

Test it

$ . install/share/bash-completion/completions/ign
$ ign log r<tab> 

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #451 (8bf5016) into ign-transport8 (b3a8182) will increase coverage by 4.19%.
The diff coverage is 80.28%.

❗ Current head 8bf5016 differs from pull request most recent head 3134c5f. Consider uploading reports for the commit 3134c5f to get more accurate results

@@                Coverage Diff                 @@
##           ign-transport8     #451      +/-   ##
==================================================
+ Coverage           83.56%   87.76%   +4.19%     
==================================================
  Files                  51       59       +8     
  Lines                5039     5696     +657     
==================================================
+ Hits                 4211     4999     +788     
+ Misses                828      697     -131     

Files	Coverage Δ
include/gz/transport/AdvertiseOptions.hh	100.00% <ø> (ø)
include/gz/transport/Clock.hh	100.00% <ø> (ø)
include/gz/transport/HandlerStorage.hh	100.00% <100.00%> (ø)
include/gz/transport/Publisher.hh	100.00% <ø> (ø)
include/gz/transport/RepHandler.hh	86.04% <ø> (+0.68%)	⬆️
include/gz/transport/ReqHandler.hh	81.65% <ø> (+1.06%)	⬆️
include/gz/transport/SubscriptionHandler.hh	85.45% <ø> (+0.54%)	⬆️
include/gz/transport/TopicStatistics.hh	100.00% <ø> (ø)
include/gz/transport/TopicStorage.hh	100.00% <100.00%> (ø)
include/gz/transport/Uuid.hh	100.00% <ø> (ø)
... and 36 more

... and 7 files with indirect coverage changes

[azeey]

@j-rivero ign_transport-ci-pr_any-bionic-amd64 job is saying /bin/bash: ./scripts/jenkins-scripts/docker/ign_transport-compilation.bash: No such file or directory. Is this a recent change?

[j-rivero]

@j-rivero ign_transport-ci-pr_any-bionic-amd64 job is saying /bin/bash: ./scripts/jenkins-scripts/docker/ign_transport-compilation.bash: No such file or directory. Is this a recent change?

ugh, this is a bug introduced probably during the move the yaml file. Should be fixed by gazebo-tooling/release-tools#1043.

[j-rivero]

@osrf-jenkins run tests

[Voldivh]

Friendly ping @azeey

[azeey]

Works for me. I'll go ahead and merge.