chore(engine): add comments regarding cmmn sentry features

related to CAM-2373
chore(engine): code cleanup

related to CAM-2839
chore(maven): cleanup pom.xml based on eclipse warnings

related to #CAM-2901
chore(mybatis): upgrade mybatis from 3.2.3 to 3.2.8

related to #CAM-2877
chore(build): add mvn profiles for servers and serverless

- add profile distro-tomcat
- add profile distro-gf31
- add profile distro-jbossas7
- add profile distro-serverless

related to #CAM-2876