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gdbstub and testing fixes for 8.2

This is the current state for my maintainer queue getting ready for
the first PR into the tree. It includes the previous testing/next
fixes as well as some more cleanups to modernise the gdbstub tests and
code. It also includes Matheus' fixes for SIGINT.

v2
  - added style patch
  - added comment move for gdbstub

The following patches still need review:

  gdbstub: move comment for gdb_register_coprocessor
  gdbstub: replace global gdb_has_xml with a function
  gdbstub: refactor get_feature_xml
  gdbstub: remove unused user_ctx field (1 acks, 1 sobs, 0 tbs)
  tests: remove test-gdbstub.py
  tests/tcg: remove quoting for info output