Add sonar-project-file parameter to ci sonar jobs

By enabling the caller to override the default project file name with
an empty string, we enable the ability to provide project settings
directly in the sonar-properties field. This removes the requirement
for a "sonar-project.properties" file in the repo.

Change-Id: Ia1069417d3bb2a742a68d6113fbd1d8e0374cbdc
Signed-off-by: Eric Ball <eball@linuxfoundation.org>