Merge check interfaces to its setup, fix dependencies & default routes

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Fix ifconfig files and ifdownup apply order

All ifcfg file resources should be created BEFORE
any ifdown action. This is strongly needed to ensure
correct dependencies for main and sub interfaces startup order

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>