Tests: remove/update obsolete skips

[edsantiago]

To silence my find-obsolete-skips script, remove the '#'
from the following issues in skip messages:

#11784 #15013 #15025 #17433 #17436 #17456

Also update the messages to reflect the fact that the issues
will never be fixed.

Also remove ubuntu skips: we no longer test ubuntu.

Also remove one buildah skip that is no longer applicable:

Fixes: #17520

Signed-off-by: Ed Santiago santiago@redhat.com

None

[openshift-ci]

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[edsantiago]

Current list of FIXME-skips:

test/e2e/
  checkpoint_image_test.go:19: SkipIfContainerized("FIXME: #15015. All checkpoint tests hang when containerized.") (still open)
  checkpoint_test.go:35: SkipIfContainerized("FIXME: #15015. All checkpoint tests hang when containerized.") (still open)
  login_logout_test.go:276: // FIXME: #18405, podman-run barfs if $REGISTRY_AUTH_FILE missing (still open)
  run_test.go:1252: SkipIfRootless("FIXME: rootless users are not allowed to mount bind-nonrecursive")
  save_test.go:125: SkipIfRootless("FIXME: Need get in rootless push sign")
  search_test.go:380: Skip("FIXME FIXME FIXME #18768: This test is a NOP") (still open)
  system_connection_test.go:227: SkipIfNotRootless(fmt.Sprintf("FIXME: set up ssh keys when root. uid(%d) euid(%d)", os.Getuid(), os.Geteuid()))
  system_service_test.go:46: Skip("FIXME: Test is too flaky (#12624)") (still open)
  system_service_test.go:86: Skip("FIXME: Test is too flaky (#12624)") (still open)
  create_test.go:314: // FIXME (#18938): this test should fail but does not! (still open)

test/system/
  900-ssh.bats:24: skip "FIXME: this is not an actual test of anything"
  200-pod.bats:499: skip_if_aarch64 "FIXME: #15074 - flakes often on aarch64" (still open)

test/buildah-bud/
  apply-podman-deltas:245: skip_if_remote "FIXME FIXME FIXME: does this test make sense in remote?" \
  apply-podman-deltas:267: skip_if_remote "FIXME: can this test be made to work under podman-remote?" \
  apply-podman-deltas:271: skip_if_rootless_remote "FIXME: #17788 tar + namespaces over http" \ (still open)
  apply-podman-deltas:277: skip_if_rootless_remote "FIXME: not sure if 17788 or some other bug" \
  apply-podman-deltas:285: #skip_if_remote "FIXME: 2023-05-04: new code, fails in podman-remote" \
  apply-podman-deltas:290: skip "FIXME: 2023-06-13 buildah PR 4746 broke this test" \

[rhatdan]

LGTM

[Luap99]

/lgtm