Update notes for submitted changes

* Allow overriding DfsPackDescription comparator for scanning packs
* Move DfsPackDescription comparators to common location
* Use Comparators for PackSource
* DfsPackDescription: Disallow null PackSource

43/ec590d0e7c6b294bcbb1f7e4c2490b6b984c20

@@ -0,0 +1,8 @@
+Verified+1: CI Bot
+Code-Review+1: Minh Thai <mthai@google.com>
+Code-Review+2: Jonathan Nieder <jrn@google.com>
+Submitted-by: Jonathan Nieder <jrn@google.com>
+Submitted-at: Fri, 01 Jun 2018 16:04:48 -0400
+Reviewed-on: https://git.eclipse.org/r/123695
+Project: jgit/jgit
+Branch: refs/heads/master

5c/02ce52d6d746270e05c2fe7bb3478d3d937f53

@@ -0,0 +1,7 @@
+Code-Review+2: Jonathan Nieder <jrn@google.com>
+Verified+1: CI Bot
+Submitted-by: Jonathan Nieder <jrn@google.com>
+Submitted-at: Fri, 01 Jun 2018 16:04:48 -0400
+Reviewed-on: https://git.eclipse.org/r/123698
+Project: jgit/jgit
+Branch: refs/heads/master

96/512f5d3bdb904b33ad4aa9a55d07889d27eb5b

@@ -0,0 +1,7 @@
+Verified+1: CI Bot
+Code-Review+2: Jonathan Nieder <jrn@google.com>
+Submitted-by: Jonathan Nieder <jrn@google.com>
+Submitted-at: Fri, 01 Jun 2018 16:04:48 -0400
+Reviewed-on: https://git.eclipse.org/r/123697
+Project: jgit/jgit
+Branch: refs/heads/master

e7/bacf0a7f8d4e6faf63d87705da07a13389e41c

@@ -0,0 +1,8 @@
+Verified+1: CI Bot
+Code-Review+1: Minh Thai <mthai@google.com>
+Code-Review+2: Jonathan Nieder <jrn@google.com>
+Submitted-by: Jonathan Nieder <jrn@google.com>
+Submitted-at: Fri, 01 Jun 2018 16:04:48 -0400
+Reviewed-on: https://git.eclipse.org/r/123696
+Project: jgit/jgit
+Branch: refs/heads/master