Adding ppc64 handling to getVdsCaps

This introduces a parser capable of interpreting the /proc/cpuinfo
present in IBM POWER hosts. It also retrieves the possible emulated
machines for QEMU guests. The POWER 7 processors are not compatible
between themselves so only the host CPU is reported as compatible
in the _getCompatibleCpuModels() function.

Change-Id: I42c4d00ace06805edbe765d975b40c9311a1fa9b
Signed-off-by: Vitor de Lima <vitor.lima@eldorado.org.br>
Reviewed-on: http://gerrit.ovirt.org/17437
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Dan Kenigsberg <danken@redhat.com>