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_regmerge/meta/main.yml

@@ -1,3 +1,2 @@
-dependencies: 
+dependencies:
   - prepare_win_tests
-

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

@@ -31,7 +31,7 @@
      - settings3.reg
 
 # test 1 -  basic test of changed behaviour
-# merge in REG_SZ 
+# merge in REG_SZ
 - name: test 1 merge in a setting
   win_regmerge:
      path: "{{win_output_dir}}\\settings1.reg"