tests: Add new test f_holedir2

This tests e2fsck's handling of both direct and extent-mapped
directoris containing holes when the i_size is 0.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

tests/f_holedir2/expect.1

@@ -0,0 +1,24 @@
+Pass 1: Checking inodes, blocks, and sizes
+Inode 12, i_size is 0, should be 5120.  Fix? yes
+
+Inode 13, i_size is 4096, should be 5120.  Fix? yes
+
+Pass 2: Checking directory structure
+Directory inode 12 has an unallocated block #3.  Allocate? yes
+
+Directory inode 13 has an unallocated block #1.  Allocate? yes
+
+Pass 3: Checking directory connectivity
+Pass 3A: Optimizing directories
+Pass 4: Checking reference counts
+Pass 5: Checking group summary information
+Free blocks count wrong for group #0 (79, counted=77).
+Fix? yes
+
+Free blocks count wrong (79, counted=77).
+Fix? yes
+
+
+test_filesys: ***** FILE SYSTEM WAS MODIFIED *****
+test_filesys: 13/16 files (7.7% non-contiguous), 23/100 blocks
+Exit status is 1

tests/f_holedir2/expect.2

@@ -0,0 +1,7 @@
+Pass 1: Checking inodes, blocks, and sizes
+Pass 2: Checking directory structure
+Pass 3: Checking directory connectivity
+Pass 4: Checking reference counts
+Pass 5: Checking group summary information
+test_filesys: 13/16 files (0.0% non-contiguous), 23/100 blocks
+Exit status is 0

tests/f_holedir2/name

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+directories with holes and zero i_size
+