Fix reading git notes from nested trees (#8026)

* Fix reading notes from nested trees

The GIT documentation for notes states "Permitted pathnames have the
form ab/cd/ef/.../abcdef...: a sequence of directory names of two
hexadecimal digits each followed by a filename with the rest of
the object ID."

* Add test case

* Fix new lines

modules/git/tests/repos/repo3_notes/COMMIT_EDITMSG

@@ -0,0 +1 @@
+2

modules/git/tests/repos/repo3_notes/HEAD

@@ -0,0 +1 @@
+ref: refs/heads/master

modules/git/tests/repos/repo3_notes/config

@@ -0,0 +1,7 @@
+[core]
+	repositoryformatversion = 0
+	filemode = false
+	bare = false
+	logallrefupdates = true
+	symlinks = false
+	ignorecase = true

modules/git/tests/repos/repo3_notes/description

@@ -0,0 +1 @@
+Unnamed repository; edit this file 'description' to name the repository.

modules/git/tests/repos/repo3_notes/logs/HEAD

@@ -0,0 +1,2 @@
+0000000000000000000000000000000000000000 ba0a96fa63532d6c5087ecef070b0250ed72fa47 Filip Navara <filip.navara@gmail.com> 1567767895 +0200	commit (initial): 1
+ba0a96fa63532d6c5087ecef070b0250ed72fa47 3e668dbfac39cbc80a9ff9c61eb565d944453ba4 Filip Navara <filip.navara@gmail.com> 1567767909 +0200	commit: 2

modules/git/tests/repos/repo3_notes/logs/refs/heads/master

@@ -0,0 +1,2 @@
+0000000000000000000000000000000000000000 ba0a96fa63532d6c5087ecef070b0250ed72fa47 Filip Navara <filip.navara@gmail.com> 1567767895 +0200	commit (initial): 1
+ba0a96fa63532d6c5087ecef070b0250ed72fa47 3e668dbfac39cbc80a9ff9c61eb565d944453ba4 Filip Navara <filip.navara@gmail.com> 1567767909 +0200	commit: 2

modules/git/tests/repos/repo3_notes/objects/3e/668dbfac39cbc80a9ff9c61eb565d944453ba4

@@ -0,0 +1,3 @@
+x
ťŽ;Â0@™s
+ďH•ă&v*!ÄÄČś4<C59B>JôŁ(p~
+G`|oxziťç©
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ŽH<C5BD>f·űfË™ÜăEm

modules/git/tests/repos/repo3_notes/objects/65/4c8b6b63c08bf37f638d3f521626b7fbbd4d37

@@ -0,0 +1 @@
+x
ќЌ;В0©}Љн‘"Зїu$„RQr‡•ЩK1F–Йщ1ЃnfЉчR-%w<>Сzcбґ{д%7Аўh#Сx¶€ЙQ¤айfXС»?jѓKЮт®ґS#8ЙЧ¦зПЦ{ЎјM©–3М> †Ёќ…Ј6Z«QЗmзїФя8В

modules/git/tests/repos/repo3_notes/refs/heads/master

@@ -0,0 +1 @@
+3e668dbfac39cbc80a9ff9c61eb565d944453ba4

modules/git/tests/repos/repo3_notes/refs/notes/commits

@@ -0,0 +1 @@
+654c8b6b63c08bf37f638d3f521626b7fbbd4d37