Change default os_config_files location

Os-collect-config will change its' default in this change:

I78b3851b35addfc16913e3cd53c9d0e7eb3d191a

We will need to also follow suit. We print a deprecation warning on
fall back to the old path so that users do not depend on the old path
working forever.

Change-Id: I4fe6e66716b83b202f4ddd5b6870eda448b4c6c8
Merge "Change default os_config_files location"