Add CPU arch filter scheduler support

In a mixed environment of running different CPU architecutres,
one would not want to run an ARM instance on a X86_64 host and
vice versa.

This scheduler filter option will prevent instances running
on a host that it is not intended for.

The libvirt driver queries the guest capabilities of the
host and stores the guest arches in the permitted_instances_types
list in the cpu_info dict of the host.

The Xen equivalent will be done later in another commit.

The arch filter will compare the instance arch against
the permitted_instances_types of a host
and filter out invalid hosts.

Also adds ARM as a valid arch to the filter.

The ArchFilter is not turned on by default.

Change-Id: I17bd103f00c25d6006a421252c9c8dcfd2d2c49b
Signed-off-by: Chuck Short <chuck.short@canonical.com>

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