libxl: Get rid of support for QEMU_USER_BASE (xen-qemuuser-domidNN)
QEMU_USER_BASE allows a user to specify the UID to use when running
the devicemodel for a specific domain number. Unfortunately, this is
not really practical: It requires nearly 32,000 entries in
/etc/passwd. QEMU_USER_RANGE_BASE is much more practical.
Remove support for QEMU_USER_BASE.
Signed-off-by: George Dunlap <george.dunlap@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>