Some cleanup of the MavenConversionIntegrationTest after getting reviewed

- simplify expandProperties testcase (REVIEW-3056, REVIEW-3052)
- moved settings.xml file into test resources (REVIEW-3053)
- moved parent pom into test resources(REVIEW-3044)
- minor cleanups (REVIEW-3052)
- consider groupId when checking if parent module is part of the build(REVIEW-3048)
- add dep in parent pom (REVIEW-3044)