Merge remote-tracking branch 'remotes/stsquad/tags/pull-testing-and-misc-updates...

Testing, gdbstub and plugin updates

  - ensure gitlab references master registry
  - add special rule for hexagon image
  - clean-up gdbstub's argument handling
  - fix replay HMP commands to accept long icount
  - minor re-factor of gdbstub replay handling
  - update syscall plugin to be more useful

# gpg: Signature made Tue 25 May 2021 16:55:16 BST
# gpg:                using RSA key 6685AE99E75167BCAFC8DF35FBD0DB095A9E2A44
# gpg: Good signature from "Alex Bennée (Master Work Key) <alex.bennee@linaro.org>" [full]
# Primary key fingerprint: 6685 AE99 E751 67BC AFC8  DF35 FBD0 DB09 5A9E 2A44

* remotes/stsquad/tags/pull-testing-and-misc-updates-250521-2:
  plugins/syscall: Added a table-like summary output
  gdbstub: tidy away reverse debugging check into function
  hmp-commands: expand type of icount to "l" in replay commands
  gdbstub: Replace GdbCmdContext with plain g_array()
  gdbstub: Constify GdbCmdParseEntry
  gitlab: add special rule for the hexagon container
  gitlab: explicitly reference the upstream registry

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>