Update Jgit to latest master revision

fd798d326 - BaseReceivePack: Add hasReceivedPack method
566a46e9e - Silence API errors for new API introduced in 5.5.2
ee00877a5 - Upgrade wagon-ssh to 3.3.4
22e153177 - Fix NPE in SystemReader in tests
ca800b55c - BaseReceivePack: Fix the format
e102bbed9 - Prepend hostname to subsection used to store file timestamp resolution
838b5a84b - Store filesystem timestamp resolution in extra jgit config
a7412b544 - Update bouncycastle version to 1.64 and Orbit to I20191106190530
ffe74210d - SystemReader: extract updating config and its parents if outdated

Adjust DelegateSystemReader to the updated SystemReader interface.

Change-Id: I4ae1352a8ea736d752ef3dc98f79efb5b792b880

java/com/google/gerrit/server/util/git/DelegateSystemReader.java

@@ -51,6 +51,11 @@ public class DelegateSystemReader extends SystemReader {
     return delegate.openSystemConfig(parent, fs);
   }
 
+  @Override
+  public FileBasedConfig openJGitConfig(Config parent, FS fs) {
+    return delegate.openJGitConfig(parent, fs);
+  }
+
   @Override
   public long getCurrentTime() {
     return delegate.getCurrentTime();