examples: fully automated fixing of E30 pep8 errors

Signed-off-by: Thomas Hisch <t.hisch@gmail.com>
examples: remove newlines @EOF + remove spaces/tabs from emtpy lines

steps to reproduce (autopep8 -i --select E111 */*.py) + remove changes
in non-empty lines

Signed-off-by: Thomas Hisch <t.hisch@gmail.com>
Merge pull request #3513 from thisch/examples_whitespace_fixes

PEP8 : fix blank-line violations in examples