Change pip_req deps and defaults set for common provider. Add galera backend support. Fix all_in_one typo.

New file 1152584-fix-create-loggger-for-keystoneclient.patch added but not implemented yet.
Pip_req will only install now for use_pip but not common provider case.
Default install mode changed to common provider and !all-in-one, i.e. 1 package per 1 service.
Galera mysql backend support should be tested.

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Add new class for setup stage and 2 config json - files for pip only.

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