[WFCORE-193] : Move org.jboss.as.test.smoke.mgmt.servermodule tests from full to core.

Removing sar deployments.
Simplifying test and updating pom with required dependencies.

Jira: https://issues.jboss.org/browse/WFCORE-193
I think this should be in org.wildfly.core.test.standalone.mgmt.api.core, as it's just testing a couple basic management ops.