Remove snapshot testing from YAML run

[codebrain]

Remove snapshot tests from YAML run. Tests fail due to this setup having a non directory location:

setup:

  - do:
      snapshot.create_repository:
        repository: test_repo_create_1
        body:
          type: fs
          settings:
            location: "test_repo_create_1_loc"

Subsequent tests then fail as test_repo_create_1 has not been created.

[Mpdreamz]

We do specify path.repos=/tmp at startup like the java runner does:

elastic/elasticsearch@177180a#diff-357e4854869b2e21c38b1b437f11095aR1055

So this should have been sufficient enough.