Introduce cache for rollouts status computation. (#509)

* Introduce cache for rollouts status computation.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Disable cache during tests.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Move cache into core.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* package private event listener.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Fix cache invalidation.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Fix sonar issues.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

* Fixed a test that assumes that target to group assignment follows a rule
which si not the case.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

hawkbit-repository/hawkbit-repository-jpa/pom.xml

@@ -121,7 +121,7 @@
          <plugin>
             <groupId>com.ethlo.persistence.tools</groupId>
             <artifactId>eclipselink-maven-plugin</artifactId>
-            <version>2.6.2</version>
+            <version>2.6.4.2</version>
             <executions>
                <execution>
                   <id>modelgen</id>
@@ -137,6 +137,9 @@
                   </goals>
                </execution>
             </executions>
+            <configuration>
+               <basePackage>org.eclipse.hawkbit.repository.jpa.model</basePackage>
+            </configuration>
             <dependencies>
                <dependency>
                   <groupId>org.eclipse.persistence</groupId>