Repair tox-sonar behavior by restoring mvn goal

Use existing builder lf-infra-maven-sonar, drop the locally
defined builder lf-infra-tox-sonar, to get desired behavior
of generating code analysis then publishing to Sonar. This
broke when hardcoded goals were removed from maven-sonar.sh.

Change-Id: I862c4857d60361d77b390425d50f3c7c77e3919d
Issue: RELENG-2359
Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>