- update build and runtime requirements
  + add rsync as build requires, new test uses code path that requires rsync
  + add perl-Digest as build requires and requires, new test generates
    a checksum
- add code to handle absence of /proc/mounts
  + this is useful when working in a local osc sandbox with osc chroot
    where /proc/mounts does not exist
- fixed typos and white space errors