[Libguestfs] [PATCH v2 0/2] lib: qemu: Memoize qemu feature detection.

[Richard W.M. Jones]

v1 -> v2:

 - Rebase on top of Pino's version work.

Two patches went upstream, these are the two remaining patches.

Note the generation number is still inside the qemu.stat file.  We
could put it in the filename, I have no particular preference.

Rich.