feat(arquillian): Force Servlet 3.0 protocol

Force the use of the Servlet 3.0 protocol with all containers, as it is
the most mature.
feat(pom.xml): Add archetype version to generated POM
fix(versions): Resolve name collision between version properties

Properties in archetype POMs must be different from those in generated
POMs. Otherwhise all properties in the generated pom.xml will be
replaced by the actual values, which undermines the idea of
parameterizing archetypes with camunda and JBoss version.
chore(archetype.properties): improve Maven coordinates of test projects
Merge branch 'arquillian-protocol-servlet'