not validating vagrant installation in gradle anymore

CHANGELOG.md

 Upcoming version:
 -----------------
+  - not validating vagrant installation in gradle anymore (Nikolaus Krismer)
   - removed provider definition from gradle (only needed within vagrant) (Nikolaus Krismer)
   - fixed syntax error in Vagrantfile (Nikolaus Krismer)
   - preparations to use libvirt on dbis-ci test system (Nikolaus Krismer)

build.gradle

@@ -87,6 +87,12 @@ scmversion {
 	releaseTagPattern = 'v([0-9.]*)'
 }
 
+vagrant {
+    installation {
+        validate = false
+    }
+}
+
 vagrantDestroy.doFirst {
 	if (!vagrantDir.isDirectory()) {
 		throw new StopExecutionException()