Merge tag '4.20-rc7-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull smb3 fix from Steve French:
 "An important smb3 fix for an regression to some servers introduced by
  compounding optimization to rmdir.

  This fix has been tested by multiple developers (including me) with
  the usual private xfstesting, but also by the new cifs/smb3 "buildbot"
  xfstest VMs (thank you Ronnie and Aurelien for good work on this
  automation). The automated testing has been updated so that it will
  catch problems like this in the future.

  Note that Pavel discovered (very recently) some unrelated but
  extremely important bugs in credit handling (smb3 flow control problem
  that can lead to disconnects/reconnects) when compounding, that I
  would have liked to send in ASAP but the complete testing of those two
  fixes may not be done in time and have to wait for 4.21"

* tag '4.20-rc7-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  smb3: Fix rmdir compounding regression to strict servers