Remove dependency to Vaadin addon tokenfield (#875)

* Removed vaadin Tokenfield dependency

Implemented own Tokenfield, but not finished yet. This branch is not
intended to be merged!!!

Signed-off-by: Markus Block <markus.block@bosch-si.com>

* added Combobox and get it running

Signed-off-by: Markus Block <markus.block@bosch-si.com>

* Fixed remaining problems, added Combobox for tag selection

Signed-off-by: Markus Block <markus.block@bosch-si.com>

* fixed permission check

Signed-off-by: Markus Block <markus.block@bosch-si.com>

* fixed tag update

Signed-off-by: Markus Block <markus.block@bosch-si.com>

* Changed Tag assignment in details tab

Removed assign button and assign a tag when it is selected. In tables
only refreshFilter when necessary.

Signed-off-by: Markus Block <markus.block@bosch-si.com>

* fixed Bulkupload

Signed-off-by: Markus Block <markus.block@bosch-si.com>

* Making Sonar happy

Signed-off-by: Markus Block <markus.block@bosch-si.com>

* Making Sonar happy

Signed-off-by: Markus Block <markus.block@bosch-si.com>

* Fixed Bug in DistTokenfield and sorted Tags in Tag list

Signed-off-by: Markus Block <markus.block@bosch-si.com>

* Making Sonar happy

Signed-off-by: Markus Block <markus.block@bosch-si.com>

* Fixed Sonar issues

Signed-off-by: Markus Block <markus.block@bosch-si.com>

* Implemented code review remarks

Signed-off-by: Markus Block <markus.block@bosch-si.com>

hawkbit-ui/pom.xml

@@ -214,10 +214,6 @@
          <groupId>org.vaadin.addons</groupId>
          <artifactId>flexibleoptiongroup</artifactId>
       </dependency>
-      <dependency>
-         <groupId>org.vaadin.addons</groupId>
-         <artifactId>tokenfield</artifactId>
-      </dependency>
       <dependency>
          <groupId>org.vaadin.alump.distributionbar</groupId>
          <artifactId>dbar-addon</artifactId>