Merge remote-tracking branch 'remotes/berrange-gitlab/tags/misc-fixes-pull-request...

Misc error reporting and checking fixes to authorization objects

# gpg: Signature made Wed 18 Nov 2020 12:48:53 GMT
# gpg:                using RSA key DAF3A6FDB26B62912D0E8E3FBE86EBB415104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>" [full]
# gpg:                 aka "Daniel P. Berrange <berrange@redhat.com>" [full]
# Primary key fingerprint: DAF3 A6FD B26B 6291 2D0E  8E3F BE86 EBB4 1510 4FDF

* remotes/berrange-gitlab/tags/misc-fixes-pull-request:
  authz-simple: Check that 'identity' property is set
  authz-pam: Check that 'service' property is set
  authz-list-file: Improve an error message
  authz-list-file: Fix file read error handling

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