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/win_setup/tasks/main.yml

@@ -21,7 +21,7 @@
   register: setup_result
 
 - name: check windows setup result
-  assert: 
+  assert:
     that:
       - "not setup_result|failed"
       - "not setup_result|changed"
@@ -51,7 +51,7 @@
       - "setup_result.ansible_facts.ansible_powershell_version"
 
 - name: check setup result only when using https
-  assert: 
+  assert:
     that:
       - "setup_result.ansible_facts.ansible_win_rm_certificate_expires"
   when: ansible_ssh_port|default(5986) != 5985