[PTS-bot] Wait for disconnect LE callback

- Wait for GATT instance disconnect callback in disconnectLE.
- Correct logging.
- Rename ptsAddress to address since PandoraServer is not only
  for PTS-bot.

Bug: 245578454
Test: Test: atest pts-bot
Ignore-AOSP-First: Cherry-pick from aosp
Merged-In: I1aece9e0ad15e23a183ed8bddf6141af60f5f505
Change-Id: I1aece9e0ad15e23a183ed8bddf6141af60f5f505