Always use HTTP 1.1 for requests

Currently we use HTTP/2 as a default but this produces problems with
GOAWAY from servers breaking the download.

For now we disable HTTP72 explicitly and should later have an option for
the cleint to enable HTTP72 on demand.

Author: laeubi

providers/bundles/org.eclipse.ecf.provider.filetransfer.httpclientjava/src/org/eclipse/ecf/internal/provider/filetransfer/httpclientjava/ECFHttpClientFactory.java

@@ -16,6 +16,7 @@
 import java.net.Authenticator;
 import java.net.http.HttpClient;
 import java.net.http.HttpClient.Redirect;
+import java.net.http.HttpClient.Version;
 import java.net.http.HttpRequest;
 import java.security.NoSuchAlgorithmException;
 import java.security.NoSuchProviderException;
@@ -51,7 +52,7 @@ public class ECFHttpClientFactory implements IHttpClientFactory {
 
 	@Override
 	public HttpClient.Builder newClient() {
-		HttpClient.Builder builder = HttpClient.newBuilder().followRedirects(Redirect.NORMAL);
+		HttpClient.Builder builder = HttpClient.newBuilder().version(Version.HTTP_1_1).followRedirects(Redirect.NORMAL);
 		String sslContextProvider = HttpClientOptions.HTTPCLIENT_SSLCONTEXT_PROVIDER;
 		String sslContextProtocol = HttpClientOptions.HTTPCLIENT_SSLCONTEXT_PROTOCOL;
 		SSLContextFactory sslContextFactory = Activator.getDefault().getSSLContextFactory();