e2fsprogs: symlink e2fsck to fsck.ext{2, 3, 4}, and tune2fs to findfs

Signed-off-by: Maxim Storchak <m.storchak@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43847 3c298f89-4303-0410-b956-a3cf2f4a3e73