doors: Add pnfs ID to billing remove entries

Doors reform billing when files are deleted, but many only included the path.
Since the path is ambiguous, this patch adds PnfsId to those notifications. In
a few cases we even have the file size available and add that too. The client
IP address is also added.

Please advice whether this should be backported to 2.10.

Target: trunk
Require-notes: yes
Require-book: yes
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: https://rb.dcache.org/r/7476/
(cherry picked from commit 6a750afd1044aba4471dbffcbee81d11d28a5270)
Merge pull request #1074 from gbehrmann/fix/2.10/rb7476

doors: Add pnfs ID to billing remove entries