Update notes for submitted changes

* [spotbugs] Fix potential NPE in FSTest
* Remove unused import in CreateFileSnapshotBenchmark
* RepositoryCache: don't require HEAD in git repositories
* FileRepository: cleanup refs outside refs/ on reftable conversion

3d/4c95293cf59f086d30c5239fdb14e76dae3919

@@ -0,0 +1,7 @@
+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+2: Jonathan Nieder <jrn@google.com>
+Submitted-by: Jonathan Nieder <jrn@google.com>
+Submitted-at: Mon, 25 Nov 2019 20:32:54 -0500
+Reviewed-on: https://git.eclipse.org/r/153359
+Project: jgit/jgit
+Branch: refs/heads/master

74/487ffa12b3ac38b2be11d2a2eace94101da8e4

@@ -0,0 +1,7 @@
+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+2: Jonathan Nieder <jrn@google.com>
+Submitted-by: Jonathan Nieder <jrn@google.com>
+Submitted-at: Mon, 25 Nov 2019 20:32:54 -0500
+Reviewed-on: https://git.eclipse.org/r/153358
+Project: jgit/jgit
+Branch: refs/heads/master

9c/b8e2f31035d265b83ba4e295aa3abb4c737ebf

@@ -0,0 +1,7 @@
+Code-Review+2: Matthias Sohn <matthias.sohn@sap.com>
+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Submitted-by: Jonathan Nieder <jrn@google.com>
+Submitted-at: Mon, 25 Nov 2019 20:32:54 -0500
+Reviewed-on: https://git.eclipse.org/r/152842
+Project: jgit/jgit
+Branch: refs/heads/master

e0/744891fe233f1b78b55ea14675d5766d3ac321

@@ -0,0 +1,8 @@
+Code-Review+2: Matthias Sohn <matthias.sohn@sap.com>
+Code-Review+2: David Pursehouse <david.pursehouse@gmail.com>
+Verified+1: Jonathan Nieder <jrn@google.com>
+Submitted-by: Jonathan Nieder <jrn@google.com>
+Submitted-at: Mon, 25 Nov 2019 20:32:54 -0500
+Reviewed-on: https://git.eclipse.org/r/153014
+Project: jgit/jgit
+Branch: refs/heads/master