Initial Contribution of the rollout-management feature

- Repository functionality for rollout, rolloutgroup entities
- Rollout scheduler to watch and handle running rollouts and start next
group of rollout
- Vaadin view to administrate rollouts and reflect the current rollout
status
- REST resources to cover rollout creation, updating, starting, pausing
and resuming

Signed-off-by: Michael Hirsch <michael.hirsch@bosch-si.com>

hawkbit-core/pom.xml

@@ -32,7 +32,6 @@
          <groupId>com.google.guava</groupId>
          <artifactId>guava</artifactId>
       </dependency>
-
       <!-- Test -->
       <dependency>
          <groupId>org.springframework.boot</groupId>