Merge remote-tracking branch 'remotes/lersek/tags/edk2-pull-2019-06-14' into staging

Merge remote-tracking branch 'remotes/lersek/tags/edk2-pull-2019-06-14' into staging

edk2-stable201905 was released on 2019-06-06:

  https://github.com/tianocore/edk2/releases/tag/edk2-stable201905

Advance QEMU's edk2 submodule to edk2-stable201905, and rebuild the
firmware binaries. This should be the edk2 release that goes into QEMU
4.1.

Launchpad: https://bugs.launchpad.net/qemu/+bug/1831477

# gpg: Signature made Fri 14 Jun 2019 21:09:29 BST
# gpg:                using RSA key D39DA71E0D496CFA
# gpg: Good signature from "Laszlo Ersek <lersek@redhat.com>" [marginal]
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: F5D9 660F 1BA5 F310 A95A  C5E0 466A EAE0 6125 3988
#      Subkey fingerprint: B3A5 5D3F 88A8 90ED 2E63  3E8D D39D A71E 0D49 6CFA

* remotes/lersek/tags/edk2-pull-2019-06-14:
  pc-bios: update the README file with edk2-stable201905 information
  pc-bios: refresh edk2 build artifacts for edk2-stable201905
  roms/Makefile.edk2: update input file list for "pc-bios/edk2-licenses.txt"
  roms/Makefile.edk2: remove edk2-stable201903 network feature test macros
  roms/edk2: update submodule from edk2-stable201903 to edk2-stable201905
  roms/Makefile.edk2: define edk2-stable201905 network feature test macros

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