Per a change in jinja2 2.9, local variables no longer are prefixed
with l_, so this updates AnsibleJ2Vars to pull in all locals (while
excluding some) regardless of name.
Fixes#20063
(cherry picked from commit 4d49b317929b86e1fc1b0cbace825ff73b372dc7)
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.