changed hostname retrieval function

CHANGELOG.md

 Upcoming version:
 -----------------
+  - changed hostname retrieval function (Nikolaus Krismer)
   - choosing vagrant provider depending on host (in gradle; not only in vagrantfile) (Nikolaus Krismer)
   - not validating vagrant installation in gradle anymore (Nikolaus Krismer)
   - removed provider definition from gradle (only needed within vagrant) (Nikolaus Krismer)

build.gradle

@@ -37,22 +37,7 @@ def getDate() {
 }
 
 def getHostname() {
-    InetAddress result = null;
-    Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
-    while (interfaces.hasMoreElements()) {
-        Enumeration<InetAddress> addresses = interfaces.nextElement().getInetAddresses();
-        while (addresses.hasMoreElements()) {
-            InetAddress address = addresses.nextElement();
-            if (!address.isLoopbackAddress()) {
-                if (address.isSiteLocalAddress()) {
-                    return address.getHostName();
-                } else if (result == null) {
-                    result = address;
-                }
-            }
-        }
-    }
-    return (result != null ? result : InetAddress.getLocalHost()).getHostName();
+    return InetAddress.getLocalHost().getHostName()
 }
 
 // Repositories, Configurations, Dependencies and SourceSets setup
@@ -107,7 +92,7 @@ scmversion {
 }
 
 vagrant {
-	def hostname = getHostname();
+	def hostname = getHostname()
 	provider = (hostname.startsWith('ci') || hostname.startsWith('dbis-ci') || hostname.startsWith('isochrone') || hostname.startsWith('dbis-isochrone')) ? 'libvirt' : 'virtualbox';
 }