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_variables/defaults/main.yml

@@ -2,4 +2,3 @@
 # defaults file for test_mysql_variables
 user: 'user1'
 password: 'password1'
-

test/integration/targets/mysql_variables/tasks/assert_var.yml

@@ -19,10 +19,10 @@
 # ============================================================
 # Assert mysql variable name and value from mysql database
 #
-- name: assert output message changed value 
+- name: assert output message changed value
   assert: { that: "output.changed == {{changed}}" }
 
-- name: run mysql command to show variable 
+- name: run mysql command to show variable
   command: mysql "-e show variables like '{{var_name}}';"
   register: result
 
@@ -32,5 +32,3 @@
        - "result.changed == true"
        - "'{{var_name}}' in result.stdout"
        - "'{{var_value}}' in result.stdout"
-
-

test/integration/targets/mysql_variables/tasks/assert_var_output.yml

@@ -19,14 +19,14 @@
 # ============================================================
 # Assert output variable name/value match mysql variable name/value
 #
-- name: assert output message changed value 
+- name: assert output message changed value
   assert: { that: "output.changed == {{changed}}" }
 
 - set_fact:
      key_name: "{{var_name}}"
      key_value: "{{output.msg[0][0]}}"
 
-- name: run mysql command to show variable 
+- name: run mysql command to show variable
   command: mysql "-e show variables like '{{var_name}}';"
   register: result
 

test/integration/targets/mysql_variables/tasks/main.yml

@@ -133,7 +133,7 @@
 
 # ============================================================
 # Verify mysql_variable fails when setting a read-only variable
-# 
+#
 - name: set value of a read only mysql variable
   mysql_variables: variable=character_set_system value=utf16
   register: result
@@ -199,4 +199,4 @@
   register: result
   ignore_errors: true
 
-- include: assert_fail_msg.yml output={{result}}  msg='unable to connect to database'
+- include: assert_fail_msg.yml output={{result}}  msg='unable to connect to database'