ocfs2: Remove struct ocfs2_journal_handle in favor of handle_t

This is mostly a search and replace as ocfs2_journal_handle is now no more
than a container for a handle_t pointer.

ocfs2_commit_trans() becomes very straight forward, and we remove some out
of date comments / code.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/suballoc.h b/fs/ocfs2/suballoc.h
index e7c4b27..1a3c94c 100644
--- a/fs/ocfs2/suballoc.h
+++ b/fs/ocfs2/suballoc.h
@@ -68,33 +68,33 @@
 			   struct ocfs2_alloc_context **ac);
 
 int ocfs2_claim_metadata(struct ocfs2_super *osb,
-			 struct ocfs2_journal_handle *handle,
+			 handle_t *handle,
 			 struct ocfs2_alloc_context *ac,
 			 u32 bits_wanted,
 			 u16 *suballoc_bit_start,
 			 u32 *num_bits,
 			 u64 *blkno_start);
 int ocfs2_claim_new_inode(struct ocfs2_super *osb,
-			  struct ocfs2_journal_handle *handle,
+			  handle_t *handle,
 			  struct ocfs2_alloc_context *ac,
 			  u16 *suballoc_bit,
 			  u64 *fe_blkno);
 int ocfs2_claim_clusters(struct ocfs2_super *osb,
-			 struct ocfs2_journal_handle *handle,
+			 handle_t *handle,
 			 struct ocfs2_alloc_context *ac,
 			 u32 min_clusters,
 			 u32 *cluster_start,
 			 u32 *num_clusters);
 
-int ocfs2_free_dinode(struct ocfs2_journal_handle *handle,
+int ocfs2_free_dinode(handle_t *handle,
 		      struct inode *inode_alloc_inode,
 		      struct buffer_head *inode_alloc_bh,
 		      struct ocfs2_dinode *di);
-int ocfs2_free_extent_block(struct ocfs2_journal_handle *handle,
+int ocfs2_free_extent_block(handle_t *handle,
 			    struct inode *eb_alloc_inode,
 			    struct buffer_head *eb_alloc_bh,
 			    struct ocfs2_extent_block *eb);
-int ocfs2_free_clusters(struct ocfs2_journal_handle *handle,
+int ocfs2_free_clusters(handle_t *handle,
 			struct inode *bitmap_inode,
 			struct buffer_head *bitmap_bh,
 			u64 start_blk,