[TESTS] load local settings for unit tests (#2152)
[TESTS] load local settings for unit tests (#2152)

* [TESTS] load local settings for unit tests

SDESK-5840

* [TESTS] don't fail if local settings are missing

SDESK-5840

* [TESTS] look for local settings in parent dirs

this avoid loading undesired settings (e.g. ones from planning).

SDESK-5840
superdesk/superdesk-core,petrjasek/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core,petrjasek/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core,superdesk/superdesk-core