Load project settings from ini file, if present.

We manage project settings in 2 files, projects.ini and projects.yaml file. If
ini file is present, read defaults from this file and parse yaml using new
format.

Closes-Bug: 1275824
Change-Id: I5bc2e81388420ce03d5379b8d75063481887243b
Merge "Load project settings from ini file, if present."