Update dependencies in org.jboss.tools.stacks and repair test failures in jbosstools_base-master job

1. Have stacks tests to be run on jenkins jbt-base master and pull request job and have them green (not just omitting stacks tests results).
2. Update versions of maven plugins used as libraries in org.jboss.tools.stacks plugin:

• org.jboss.jdf.stacks-client; 1.0.3.Final -> no change
• org.yaml.snakeyaml; 1.10 -> 1.18
• org.apache.httpcomponents.httpclient; 4.0.1 -> 4.5.5
• org.apache.httpcomponents.httpcore; 4.0.1 -> 4.4.9
• org.jboss.logging.jboss-logging; 3.1.2.GA -> 3.3.2.Final

3. Run all stacks.tests available (only one test class was run)
4. Check on dependencies and usages in org.jboss.jdf.stacks-client and org.jboss.tools.stacks (what needs to be update, does it broke something, what else is using it)