* [build] Fix warnings reported by flake8 checker

* [build] Allow to build Tizen apps with variants

This change adds a possibility to build Tizen applications with e.g.
ASAN sanitizer enabled. Please note, that with current Tizen SDK there
is no TSAN library (TSAN for ARMv7) provided, so it's not possible to
enable this sanitizer.

* Restyled by autopep8

Co-authored-by: Justin Wood <woody@apple.com>
Co-authored-by: Restyled.io <commits@restyled.io>