Merge branch 'stable-5.4'

* stable-5.4:
  SystemReader: Respect passed-in parent when no system config is present
  Prepare 5.4.0-SNAPSHOT builds
  JGit v5.4.0.201905221418-m3
  Prepare 5.4.0-SNAPSHOT builds
  JGit v5.4.0.201905081430-m2

Change-Id: If69cb0afe9915b926d977e4ad26c7d72db31667c
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/util/SystemReader.java

@@ -101,7 +101,7 @@ public abstract class SystemReader {
 		public FileBasedConfig openSystemConfig(Config parent, FS fs) {
 			File configFile = fs.getGitSystemConfig();
 			if (configFile == null) {
-				return new FileBasedConfig(null, fs) {
+				return new FileBasedConfig(parent, null, fs) {
 					@Override
 					public void load() {
 						// empty, do not load