HDDS-3826. Split Ozone FS acceptance tests

[adoroszlai]

What changes were proposed in this pull request?

1. Split monolithic Ozone FS acceptance test case into several steps. This improves feedback about test progress, and makes easier to find out what's wrong in case of a failure. (Unfortunately most subsequent steps still depend on earlier ones. Improving that would be nice, but would make the test slower due to the necessary extra setup steps.)
2. Run test setup in proper Setup instead of a test case.
3. Split test setup into reusable keywords.
4. Add functions for formatting Ozone FS URLs with both o3fs and ofs flavor. Includes its own test cases.
5. Test execution for ofs and o3fs is controlled outside of the test script. This is necessary to avoid duplication of test cases and/or keywords.
6. Pass SECURITY_ENABLED and similar variables as Robot variables (-v), not environment ones (-e). This allows setting default value in Robot tests, which makes it easier to run the test from command-line.

Most of this is in preparation for bucket links, as the same test should be executed for regular buckets and links. Submitting as a separate PR for easier review.

Note that this PR is based on top of the change for #1091, a minor improvement which is necessary to save output of multiple executions of the same test suite (ozonefs.robot in this case).

https://issues.apache.org/jira/browse/HDDS-3826

How was this patch tested?

Ran tests for lib locally (no docker-compose):

$ robot lib
...
Lib.Fs Tests                                                          | PASS |
...
Lib.String Tests                                                      | PASS |
...

Ran Ozone FS tests inside docker container bypassing test.sh:

$ docker-compose exec scm robot smoketest/ozonefs/ozonefs.robot
...
Ozonefs :: Ozone FS tests                                             | PASS |
20 critical tests, 20 passed, 0 failed

$ docker-compose exec scm robot -v SCHEME:o3fs smoketest/ozonefs/ozonefs.robot
...
Ozonefs :: Ozone FS tests                                             | PASS |
20 critical tests, 20 passed, 0 failed

Full acceptance test suite:
https://github.com/adoroszlai/hadoop-ozone/runs/783679213
https://github.com/adoroszlai/hadoop-ozone/runs/784247369

[elek]

Pass SECURITY_ENABLED and similar variables as Robot variables (-v), not environment ones (-e). This allows setting default value in Robot tests, which makes it easier to run the test from command-line.

DANCING BANANA. Thank you very much,

The patch LGTM.

One comment: string_test.robot and fs_test.robot seems to be duplicate of robot.robot. (I guess you refactored the robot.robot to two separated files.) I think one of them can be removed.

[adoroszlai]

One comment: string_test.robot and fs_test.robot seems to be duplicate of robot.robot. I think one of them can be removed.

Nice catch.

(I guess you refactored the robot.robot to two separated files.)

Exactly.

[elek]

Thanks the update (and the patch): merging to the master.

[adoroszlai]

Thanks @elek for reviewing and committing it.