Merge remote-tracking branch 'mreitz/tags/pull-block-2019-02-25' into queue-block

Block patches:
- Fix various issues with bdrv_refresh_filename()
- Fix various iotests
- Include LUKS overhead in qemu-img measure for qcow2
- A fix for vmdk's image creation interface

# gpg: Signature made Mon Feb 25 15:13:43 2019 CET
# gpg:                using RSA key F407DB0061D5CF40
# gpg: Good signature from "Max Reitz <mreitz@redhat.com>"
# Primary key fingerprint: 91BE B60A 30DB 3E88 57D1  1829 F407 DB00 61D5 CF40

* mreitz/tags/pull-block-2019-02-25: (45 commits)
  iotests: Skip 211 on insufficient memory
  vmdk: false positive of compat6 with hwversion not set
  iotests: add LUKS payload overhead to 178 qemu-img measure test
  qcow2: include LUKS payload overhead in qemu-img measure
  iotests.py: s/_/-/g on keys in qmp_log()
  iotests: Let 045 be run concurrently
  iotests: Filter SSH paths
  iotests.py: Filter filename in any string value
  iotests.py: Add is_str()
  iotests: Fix 207 to use QMP filters for qmp_log
  iotests: Fix 232 for LUKS
  iotests: Remove superfluous rm from 232
  iotests: Fix 237 for Python 2.x
  iotests: Re-add filename filters
  iotests: Test json:{} filenames of internal BDSs
  block: BDS options may lack the "driver" option
  block/null: Generate filename even with latency-ns
  block/curl: Implement bdrv_refresh_filename()
  block/curl: Harmonize option defaults
  block/nvme: Fix bdrv_refresh_filename()
  ...

Signed-off-by: Kevin Wolf <kwolf@redhat.com>