examples: fix pep8 error classes E111 and E113

Signed-off-by: Thomas Hisch <t.hisch@gmail.com>
remove unused path_exists function in rc_traits example
rerun autopep8

Signed-off-by: Thomas Hisch <t.hisch@gmail.com>
Merge pull request #3515 from thisch/examples_pep8_e111_e113

examples: fix pep8 error classes E111 and E113