testing/tests/download: test git special ref

Add a special ref to the static repo and check on the git refs test case
the download of a git package:
 - with the sha1 of a special ref as version;

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@datacom.ind.br>
Cc: Arnout Vandecappelle <arnout@mind.be>
[Arnout: change to use the sha1 of a special ref instead of the name]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

support/testing/tests/download/br2-external/git-refs/package/git-special-ref/git-special-ref.hash

@@ -0,0 +1,2 @@
+sha256  e78abd24049c6acac81a02fb8fa6dfa60db74a19772d41e28ad9d6b9b77c8054  git-special-ref-b72ff6078f62522a87f5cae5e9f34dedf5ec3885.tar.gz
+sha256  b252b594be4679764e2e06cfea77a3e50638dd445af9b472b0f298c43b134518  file

support/testing/tests/download/br2-external/git-refs/package/git-special-ref/git-special-ref.mk

@@ -0,0 +1,11 @@
+################################################################################
+#
+# git-special-ref
+#
+################################################################################
+
+GIT_SPECIAL_REF_VERSION = b72ff6078f62522a87f5cae5e9f34dedf5ec3885
+GIT_SPECIAL_REF_SITE = git://localhost:$(GITREMOTE_PORT_NUMBER)/repo.git
+GIT_SPECIAL_REF_LICENSE_FILES = file
+
+$(eval $(generic-package))

support/testing/tests/download/git-remote/repo.git/objects/b7/2ff6078f62522a87f5cae5e9f34dedf5ec3885

@@ -0,0 +1,3 @@
+x
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+h Œ1^À�ž€¦Š‘ÌÐL\x{;qáÞ¸}‹ŸŸ{kujkèa�!; •ùÈ<@)Dh„|av·-	NÝÒ�}êdlÜ�KæhVv�£u©Ø¼cÝ‹‘	X¥Ïùч~«9
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support/testing/tests/download/git-remote/repo.git/refs/changes/01/1/2

@@ -0,0 +1 @@
+b72ff6078f62522a87f5cae5e9f34dedf5ec3885

support/testing/tests/download/test_git.py

@@ -76,6 +76,7 @@ class TestGitRefs(GitTestBase):
         self.check_download("git-sha1-reachable-by-tag")
         self.check_download("git-sha1-tag-itself")
         self.check_download("git-sha1-tag-points-to")
+        self.check_download("git-special-ref")
         self.check_download("git-submodule-disabled")
         self.check_download("git-submodule-enabled")
         self.check_download("git-tag")