Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20200325b' into staging

Combo Migration/HMP/virtiofs pull

Small fixes all around.
Ones that are noticeable:
  a) Igor's migration compatibility fix affecting older machine types
     has been seen in the wild
  b) Philippe's autconverge fix should fix an intermittently
     failing migration test.
  c) Mao's makes a small change to the output of 'info
     migrate_parameters'  for tls-authz.

# gpg: Signature made Wed 25 Mar 2020 13:14:48 GMT
# gpg:                using RSA key 45F5C71B4A0CB7FB977A9FA90516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>" [full]
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert/tags/pull-migration-20200325b:
  migration: use "" instead of (null) for tls-authz
  migration/ram: fix use after free of local_err
  migration/colo: fix use after free of local_err
  vl.c: fix migration failure for 3.1 and older machine types
  tools/virtiofsd/passthrough_ll: Fix double close()
  hmp/vnc: Fix info vnc list leak
  tests/migration: Reduce autoconverge initial bandwidth
  xbzrle: update xbzrle doc
  hmp-cmd: fix a missing_break warning

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

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