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/mysql_user/tasks/assert_user.yml

@@ -1,4 +1,4 @@
-# test code to assert mysql user 
+# test code to assert mysql user
 # (c) 2014,  Wayne Rosario <wrosario@ansible.com>
 
 # This file is part of Ansible
@@ -17,11 +17,11 @@
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
 # ============================================================
-- name: run command to query for mysql user 
+- name: run command to query for mysql user
   command: mysql "-e SELECT User FROM mysql.user where user='{{ user_name }}';"
   register: result
 
-- name: assert mysql user is present 
+- name: assert mysql user is present
   assert: { that: "'{{ user_name }}' in result.stdout" }
 
 - name: run command to show privileges for user (expect privileges in stdout)
@@ -29,6 +29,6 @@
   register: result
   when: priv is defined
 
-- name: assert user has giving privileges 
+- name: assert user has giving privileges
   assert: { that: "'GRANT {{priv}} ON *.*' in result.stdout" }
   when: priv is defined