Merge pull request #897 from sebastiankirsch/master

[Extended Authentication] Enable usage of system properties for HttpClient

src/main/java/io/fabric8/maven/docker/access/ecr/EcrExtendedAuth.java

@@ -91,7 +91,7 @@ private JSONObject getAuthorizationToken(AuthConfig localCredentials) throws IOE
     }
 
     CloseableHttpClient createClient() {
-        return HttpClients.createDefault();
+        return HttpClients.custom().useSystemProperties().build();
     }
 
     private JSONObject executeRequest(CloseableHttpClient client, HttpPost request) throws IOException, MojoExecutionException {