RootCanal: Make output pcap trace filenames more identifiable

Generate the files with the pattern:
  rootcanal_$id_$address(_$n).pcap

Where
- $id is the *unique* device identifier
- $address is the *assigned* device address (reused)
- $n serves to dedup identical file names
  (in case rootcanal is restarted)

Test: m root-canal
Bug: 330185630
Flag: EXEMPT, tool change
Change-Id: If5dfedc713bd94e521dafcd0237aa853054bad4e