Merge branch '2.2' into 3.0

# Conflicts:
#	README.md
#	gns3server/compute/base_node.py
#	gns3server/compute/dynamips/__init__.py
#	gns3server/compute/dynamips/hypervisor.py
#	gns3server/compute/qemu/__init__.py
#	gns3server/compute/qemu/qemu_vm.py
#	gns3server/controller/__init__.py
#	gns3server/crash_report.py
#	gns3server/handlers/api/controller/node_handler.py
#	gns3server/schemas/qemu_template.py
#	gns3server/static/web-ui/index.html
#	gns3server/static/web-ui/main.11410ae4eaf4d4c08cd0.js
#	gns3server/version.py
#	requirements.txt

gns3server/utils/asyncio/__init__.py

@@ -72,7 +72,7 @@ async def subprocess_check_output(*args, cwd=None, env=None, stderr=False):
         proc = await asyncio.create_subprocess_exec(*args, stderr=asyncio.subprocess.PIPE, cwd=cwd, env=env)
         output = await proc.stderr.read()
     else:
-        proc = await asyncio.create_subprocess_exec(*args, stdout=asyncio.subprocess.PIPE, cwd=cwd, env=env)
+        proc = await asyncio.create_subprocess_exec(*args, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.DEVNULL, cwd=cwd, env=env)
         output = await proc.stdout.read()
     if output is None:
         return ""