Refactor caches (#2775)

* added static usage of cache in order access it easier
* added mandatory (in hawkbit-core) registration - always tenant aware caches shall be used - hawkbit depends on it
* added per cache and tenant name configuration
* (not really realted to caches) but in order to be easier evicted entities after commit handlers are now statically accessed

Signed-off-by: Avgustin Marinov <Avgustin.Marinov@bosch.com>

hawkbit-rest-core/pom.xml

@@ -74,10 +74,6 @@
             <artifactId>commons-io</artifactId>
             <version>${commons-io.version}</version>
         </dependency>
-        <dependency>
-            <groupId>com.github.ben-manes.caffeine</groupId>
-            <artifactId>caffeine</artifactId>
-        </dependency>
 
         <!-- Test -->
         <dependency>