Feature hawkbit uaa extension (#317)

* use UserPrincipal to determine tenant at runtime

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

* add hawkbit-uaa extension

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

* adapt WithSpringAuthorityRule with UserPrincipal for determine tenant

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

* fix String principal in DDI download resource

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

* merge the email to the UserPrincipal from the master manually

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

* Fixed some grammar issues and typos

Signed-off-by: Dominic Schabel <dominic.schabel@bosch-si.com>

extensions/pom.xml

@@ -0,0 +1,27 @@
+<!--
+
+    Copyright (c) 2015 Bosch Software Innovations GmbH and others.
+
+    All rights reserved. This program and the accompanying materials
+    are made available under the terms of the Eclipse Public License v1.0
+    which accompanies this distribution, and is available at
+    http://www.eclipse.org/legal/epl-v10.html
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+   <modelVersion>4.0.0</modelVersion>
+   <parent>
+      <groupId>org.eclipse.hawkbit</groupId>
+      <artifactId>hawkbit-parent</artifactId>
+      <version>0.2.0-SNAPSHOT</version>
+   </parent>
+   <artifactId>hawkbit-extensions-parent</artifactId>
+   <packaging>pom</packaging>
+   <name>hawkBit :: Extensions</name>
+   <description>Parent pom for hawkBit extensions</description>
+
+   <modules>
+      <module>hawkbit-extension-uaa</module>
+   </modules>
+
+</project>