ext4-new-features: modify wrong pathname in ext4-alloc-test.sh

1. set $LTPROOT/testcases/data/ext4-ffsb to be the INSTALL_DIR of ext4-ffsb-config
2. make ext4-alloc-test.sh use above pathname for ffsb-config files

Signed-off-by: Zorro Lang <zlang@redhat.com>
ext4-new-features: modify wrong pathname in ext4_test_inode_version.c

remove ./ from ./ext4_get_inode_version.sh in ext4_test_inode_version.c

Signed-off-by: Zorro Lang <zlang@redhat.com>