Merge branch '2.2' into 3.0

# Conflicts:
#	CHANGELOG
#	dev-requirements.txt
#	gns3server/compute/qemu/__init__.py
#	gns3server/compute/vmware/__init__.py
#	gns3server/controller/snapshot.py
#	gns3server/crash_report.py
#	gns3server/handlers/api/compute/atm_switch_handler.py
#	gns3server/run.py
#	gns3server/static/web-ui/26.77d4bfd104f37c42e028.js
#	gns3server/static/web-ui/index.html
#	gns3server/static/web-ui/runtime.415291667f70565cd8ef.js
#	gns3server/utils/__init__.py
#	gns3server/utils/images.py
#	gns3server/utils/interfaces.py
#	gns3server/version.py
#	gns3server/web/web_server.py
#	pytest.ini
#	requirements.txt
#	scripts/update-bundled-web-ui.sh
#	setup.py
#	tests/api/routes/compute/test_dynamips_nodes.py
#	tests/compute/builtin/nodes/test_cloud.py
#	tests/compute/docker/test_docker.py
#	tests/compute/docker/test_docker_vm.py
#	tests/compute/dynamips/test_dynamips_manager.py
#	tests/compute/dynamips/test_dynamips_router.py
#	tests/compute/iou/test_iou_vm.py
#	tests/compute/qemu/test_qcow2.py
#	tests/compute/qemu/test_qemu_manager.py
#	tests/compute/qemu/test_qemu_vm.py
#	tests/compute/test_base_node.py
#	tests/compute/test_manager.py
#	tests/compute/test_project.py
#	tests/compute/traceng/test_traceng_vm.py
#	tests/compute/virtualbox/test_virtualbox_manager.py
#	tests/compute/virtualbox/test_virtualbox_vm.py
#	tests/compute/vmware/test_vmware_manager.py
#	tests/compute/vmware/test_vmware_vm.py
#	tests/compute/vpcs/test_vpcs_vm.py
#	tests/conftest.py
#	tests/controller/gns3vm/test_remote_gns3_vm.py
#	tests/controller/gns3vm/test_virtualbox_gns3_vm.py
#	tests/controller/gns3vm/test_vmware_gns3_vm.py
#	tests/controller/test_export_project.py
#	tests/controller/test_gns3vm.py
#	tests/controller/test_import_project.py
#	tests/test_config.py
#	tests/utils/test_asyncio.py
#	tests/utils/test_images.py
#	tests/web/test_response.py

tests/compute/docker/test_docker.py

@@ -247,7 +247,7 @@ async def test_install_busybox_dynamic_linked():
                 with pytest.raises(DockerError) as e:
                     dst_dir = Docker.resources_path()
                     await Docker.install_busybox(dst_dir)
-                assert str(e.value) == "No busybox executable could be found"
+                assert str(e.value) == "No busybox executable could be found, please install busybox (apt install busybox-static on Debian/Ubuntu) and make sure it is in your PATH"
 
 
 @pytest.mark.asyncio
@@ -258,4 +258,4 @@ async def test_install_busybox_no_executables():
             with pytest.raises(DockerError) as e:
                 dst_dir = Docker.resources_path()
                 await Docker.install_busybox(dst_dir)
-            assert str(e.value) == "No busybox executable could be found"
+            assert str(e.value) == "No busybox executable could be found, please install busybox (apt install busybox-static on Debian/Ubuntu) and make sure it is in your PATH"