Layer updates:
poky -> warrior 2.7.1 tag
meta-openembedded -> latest in warrior branch
meta-mingw -> warrior 2.7.1 tag
meta-tegra -> latest in warrior branch

Removed & modified bbappends:
recipes-support/rng-tools/*
  fixed in poky by commit
  81fc280bae13c573d8b82b05ad5eb18e7882ad24 rng-tools: Fix crazy defaults

recipes-devtools/python/*
  upstream patch removed by .bbappend files removed in poky by commit
  e2c3247c233876ab090c9ce3d5325a6d46ab350f python3: upgrade to 3.7.2

recipes-multimedia/*, recipes-qt/images/* & other gstreamer010 related:
  gstreamer0.10 recipes removed in meta-openembedded by commit
  010c2f388095c1615b99d9f38a26bbd0c9e77b39 gstreamer-0.10: Remove recipes

meta-tegra-extras:
  initscript overlays updated after meta-tegra commit
  74af7320d37e1d53856a5225a6d6414a05adb5ec meta: unify initramfs and initrdscripts recipes

  removed linux-tegra fbcon patch as it was fixed with commit
  cdb1395244e38ecce26f13c6981e911f5cde5591 video: modedb: fb_videomode compare with tolerance

Change-Id: I586f7be3ba198b603bc98d72c5741d594e248c5c
Reviewed-by: Samuli Piippo <samuli.piippo@qt.io>