ceph-disk: multipath support for is_partition and list_partitions
The is_partition predicate and the list_partitions function support
devices managed by multipath.
A set of helpers dedicated to multipath devices is implemented because
the content of the corresponding /sys directory does not use the same
conventions as regular devices regarding partitions.
Instead of relying on subdirectories such as /sys/block/name/name1, the
devicemapper uuid file is used and expected to start with part\d+. The
holders/slaves directories provide pointers between the whole device and
the partition devices.
Although these structural differences reduce the opportunity for
code factorization, it is easier for backward compatibility since the
multipath specific logic is limited to if is_mpath(dev) branches.
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