DB and RabbitMQ integration tests and PostgreSQL testing/bug fixing (#1047)

* Initial matrixSigned-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* License header

* MySQL DB testSigned-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Create matrix for DBsSigned-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* RabbitMQ and H2Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* MySQL 8.0Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Postgresql test supportSigned-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Postgresql test supportSigned-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Fix DB issues post and mssql

Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Wait MSSQL

Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Fix postgresql tests.

Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* MSSQL startup fix.Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Fix syntax error

Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Further fix postgres tests.Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Revert unnecessary changes.

Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Add SonarCloud Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

* Simplify devcontainer. Test JDK 15Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

.azure-pipelines/rabbitmq-template.yml

@@ -0,0 +1,9 @@
+parameters:
+  - name: rabbitmqVersion
+    displayName: RabbitMQ Version
+    type: string
+    default: "3.8"
+
+steps:
+  - script: docker run -d --name rabbit -p 15672:15672 -p 5672:5672 -e RABBITMQ_DEFAULT_VHOST=/ rabbitmq:${{ parameters.rabbitmqVersion }}-management
+    displayName: "Setup RabbitMQ docker instance"