Context: Some backends may have used different names in
the past (like IME backend use to be IM). Legacy scripts
may break.
This patch adds a legacy name option in the aiori structure.
Both name and legacy name work to select the interface.
But the following warning is printed if the legacy name is used:
ior WARNING: [legacy name] backend is deprecated use [name] instead.
This patch adds initialize, finalize and stat calls to
the IME backend. statfs, mkdir and rmdir are currently
not supported. This patch also fixes the IME_GetVersion
call.