Fix cosmetic problems in YAML source

This change corrects problems reported by the `yamllint` linter.

Since key duplication problems were removed in 4d48711, this commit
mainly fixes trailing spaces and extra empty lines at beginning/end of
files.

test/integration/targets/ops_command/tasks/cli.yaml

@@ -13,5 +13,3 @@
   with_items: "{{ test_items }}"
   loop_control:
     loop_var: test_case_to_run
-
-

test/integration/targets/ops_command/tasks/main.yaml

@@ -1,3 +1,2 @@
 ---
 - { include: cli.yaml, tags: ['cli'] }
-