Merge branch '2.2' into 3.0

# Conflicts:
#	gns3server/compute/base_node.py
#	gns3server/compute/docker/__init__.py
#	gns3server/compute/qemu/qemu_vm.py
#	gns3server/controller/compute.py
#	gns3server/controller/gns3vm/virtualbox_gns3_vm.py
#	gns3server/controller/node.py
#	gns3server/controller/project.py
#	gns3server/crash_report.py
#	gns3server/handlers/api/controller/template_handler.py
#	gns3server/static/web-ui/index.html
#	gns3server/static/web-ui/main.8448c96e4facbe79a613.js
#	gns3server/version.py
#	tests/compute/iou/test_iou_vm.py
#	tests/compute/qemu/test_qemu_vm.py
#	tests/handlers/api/controller/test_template.py

gns3server/utils/asyncio/__init__.py

@@ -70,10 +70,10 @@ async def subprocess_check_output(*args, cwd=None, env=None, stderr=False):
 
     if stderr:
         proc = await asyncio.create_subprocess_exec(*args, stderr=asyncio.subprocess.PIPE, cwd=cwd, env=env)
-        output = await proc.stderr.read()
+        _, output = await proc.communicate()
     else:
         proc = await asyncio.create_subprocess_exec(*args, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.DEVNULL, cwd=cwd, env=env)
-        output = await proc.stdout.read()
+        output, _ = await proc.communicate()
     if output is None:
         return ""
     # If we received garbage we ignore invalid characters