Update notes for submitted changes

* Fix NPE in RebaseTodoFile#parseComments
* Fix NPE in ObjectIdOwnerMap#get
* Fix NPE in CommitOnlyTest#getHead
* FileUtils#lastModifiedInstant should not log error if path doesn't exist
* Cache user global and system-wide git configurations
* Avoid setup and saving FileStoreAttributes compete for ~/.gitconfig lock

31/356f5d181ea1a1c43b44d9dfbe9e8e81aed984

@@ -0,0 +1,7 @@
+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+2: David Pursehouse <david.pursehouse@gmail.com>
+Submitted-by: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-at: Mon, 19 Aug 2019 04:40:40 -0400
+Reviewed-on: https://git.eclipse.org/r/147861
+Project: jgit/jgit
+Branch: refs/heads/stable-5.1

41/da8de001794dcd6a3e782c313cc65abe7d4392

@@ -0,0 +1,7 @@
+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+2: David Pursehouse <david.pursehouse@gmail.com>
+Submitted-by: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-at: Mon, 19 Aug 2019 04:40:40 -0400
+Reviewed-on: https://git.eclipse.org/r/147862
+Project: jgit/jgit
+Branch: refs/heads/stable-5.1

7f/92a70fb3a5b7e91e5d370098fa65f6c8f35efa

@@ -0,0 +1,7 @@
+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+2: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-by: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-at: Mon, 19 Aug 2019 04:40:40 -0400
+Reviewed-on: https://git.eclipse.org/r/147522
+Project: jgit/jgit
+Branch: refs/heads/stable-5.1

86/a567f6152315f5d55309c7119885d0fa3476ce

@@ -0,0 +1,7 @@
+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+2: David Pursehouse <david.pursehouse@gmail.com>
+Submitted-by: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-at: Mon, 19 Aug 2019 04:40:40 -0400
+Reviewed-on: https://git.eclipse.org/r/147864
+Project: jgit/jgit
+Branch: refs/heads/stable-5.1

a4/216e5382026ff9956af82322c7c5af24e0f245

@@ -0,0 +1,7 @@
+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+2: David Pursehouse <david.pursehouse@gmail.com>
+Submitted-by: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-at: Mon, 19 Aug 2019 04:40:40 -0400
+Reviewed-on: https://git.eclipse.org/r/147863
+Project: jgit/jgit
+Branch: refs/heads/stable-5.1

f3/83206ace187ec92672b806e18a54e8d398a27d

@@ -0,0 +1,8 @@
+Code-Review+1: Thomas Wolf <thomas.wolf@paranor.ch>
+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+2: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-by: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-at: Mon, 19 Aug 2019 04:40:40 -0400
+Reviewed-on: https://git.eclipse.org/r/147753
+Project: jgit/jgit
+Branch: refs/heads/stable-5.1