fix lvmdiskscan volume reporting when using lvm shell

[Bryn M. Reeves <breeves@redhat.com>]

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Currently lvmdiskscan uses four global counters to track the number of
disks, partitions & PVs located. These are statically initialised to
zero but are never reset between runs.

This is fine for the standalone command but causes mis-reporting when
the tool is repeatedly run in the lvm shell:

# lvm
lvm> lvmdiskscan
  /dev/ramdisk               [       16.00 MB]
  /dev/loop0                 [      500.00 MB] LVM physical volume
[...]
  7 disks
  14 partitions
  0 LVM physical volume whole disks
  1 LVM physical volume
lvm> lvmdiskscan
  /dev/ramdisk               [       16.00 MB]
  /dev/loop0                 [      500.00 MB] LVM physical volume
[...]
  14 disks
  28 partitions
  0 LVM physical volume whole disks
  2 LVM physical volumes

etc.

Patch just moves the initialisation into the lvmdiskscan function.

Regards,
Bryn.
	
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