validate-launcher: pep8ify sources.
validate-launcher: baseclasses: fix various pyflakes / uncaught pep8 issues.
validate-launcher: loggable: fix various pyflakes / uncaught pep8 issues.
validate-launcher: main: fix various pyflakes / uncaught pep8 issues.
validate-launcher: utils: fix various pyflakes / uncaught pep8 issues.
apps: gstvalidate.py: fix various pyflakes / uncaught pep8 issues.