Fix wrong NON_PROXY_HOSTS constant

Stick with the usual "http.nonProxyHosts" system property
for defining a non-proxy list.

Change-Id: I0d4f73d15af8ed78f856737a5dd89ebfca407a42
Signed-off-by: Michael Ochmann <michael.ochmann@sap.com>
diff --git a/org.eclipse.skalli.core/src/main/java/org/eclipse/skalli/core/destination/DestinationComponent.java b/org.eclipse.skalli.core/src/main/java/org/eclipse/skalli/core/destination/DestinationComponent.java
index 59b1904..bb98b4d 100644
--- a/org.eclipse.skalli.core/src/main/java/org/eclipse/skalli/core/destination/DestinationComponent.java
+++ b/org.eclipse.skalli.core/src/main/java/org/eclipse/skalli/core/destination/DestinationComponent.java
@@ -55,7 +55,7 @@
     private static final String HTTP_PROXY_PORT = "http.proxyPort"; //$NON-NLS-1$
     private static final String HTTPS_PROXY_HOST = "https.proxyHost"; //$NON-NLS-1$
     private static final String HTTPS_PROXY_PORT = "https.proxyPort"; //$NON-NLS-1$
-    private static final String NON_PROXY_HOSTS = "proxy.nonProxyHosts"; //$NON-NLS-1$
+    private static final String NON_PROXY_HOSTS = "http.nonProxyHosts"; //$NON-NLS-1$
 
     @SuppressWarnings("nls")
     private static final String[] SSL_PROTOCOLS = new String[] { "TLS", "SSLv3", "SSLv2", "SSL" };