Allow to have code in differently named directory
Allow to have code in differently named directory

So far the directory name had to be identical to the source package
name. This change allows the names to be different. The name of the
directory can be passed as `--main-repo-dir` parameter to make-source.

Change-Id: I4a22177669633b50e9e96e27383cdfd55da54196

sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts