Move restorevol to bin from sbin

Move restorevol to bin from sbin

restorevol only requires access to a dump file and write access to the
directory in which the dump is being unpacked.  It doesn't require being
a superuser, so it should be installed in bin instead of sbin.  Also
move the man page to section 1 and update references accordingly.

Reviewed-on: http://gerrit.openafs.org/333
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>