Finalize tests for initial JavaHandler

.gitlab-ci.yml

ragconnect.tests/.gitignore

...t/java/org/jastadd/ragconnect/tests/AbstractMqttTest.java

...ts/src/test/java/org/jastadd/ragconnect/tests/Errors.java

.../src/test/java/org/jastadd/ragconnect/tests/JavaTest.java

...st/java/org/jastadd/ragconnect/tests/MqttHandlerTest.java

...est/java/org/jastadd/ragconnect/tests/RagConnectTest.java

...st/java/org/jastadd/ragconnect/tests/RegressionTests.java

.../src/test/java/org/jastadd/ragconnect/tests/Warnings.java

...a/org/jastadd/ragconnect/tests/relation/RelationTest.java

ragconnect.tests/src/test/resources/log4j2.xml