Merge branch 'stable-4.9'

* stable-4.9:
  InMemoryRepository: Make inner class MemObjDatabase static

Change-Id: I62bb5957de1ae3bc6030ea2181b09efccc48252b
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/InMemoryRepository.java

@@ -89,7 +89,7 @@ public class InMemoryRepository extends DfsRepository {
 	}
 
 	/** DfsObjDatabase used by InMemoryRepository. */
-	public class MemObjDatabase extends DfsObjDatabase {
+	public static class MemObjDatabase extends DfsObjDatabase {
 		private List<DfsPackDescription> packs = new ArrayList<>();
 		private int blockSize;