e2fsprogs: Ensure we use the right mke2fs.conf when restoring from sstate

e2fsprogs: Ensure we use the right mke2fs.conf when restoring from sstate

If we don't do this, we can use an mke2fs.conf from a different path which
may contain incompatible flags and lead to obtuse build failures such as:

Invalid filesystem option set: has_journal,extent,huge_file,flex_bg,metadata_csum,64bit,dir_nlink,extra_isize

To fix this, wrap the mke2fs binary and its hardlinks and point at the
correct configuration file.

In particular this fixes conflicts between master and jethro builds
affecting the main autobuilder.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>