Update the isort multi line output setting

These changes follow up the "Fix and improve tests for Python != 3.7" PR.

Author: Jamim

.isort.cfg

@@ -1,3 +1,11 @@
 [settings]
-force_single_line=True
 from_first=True
+
+; 3 stands for Vertical Hanging Indent, e.g.
+; from third_party import (
+;     lib1,
+;     lib2,
+;     lib3,
+; )
+; docs: https://github.com/timothycrosley/isort#multi-line-output-modes
+multi_line_output=3

opentelemetry-api/src/opentelemetry/loader.py

@@ -61,10 +61,7 @@ def my_factory_for_t(api_type: typing.Type[T]) -> typing.Optional[T]:
 means that the Python interpreter was invoked with the ``-E`` or ``-I`` flag).
 """
 
-from typing import Callable
-from typing import Optional
-from typing import Type
-from typing import TypeVar
+from typing import Callable, Optional, Type, TypeVar
 import importlib
 import os
 import sys

opentelemetry-api/src/opentelemetry/trace/__init__.py

@@ -64,8 +64,7 @@
 from contextlib import contextmanager
 import typing
 
-from opentelemetry import loader
-from opentelemetry import types
+from opentelemetry import loader, types
 
 # TODO: quarantine
 ParentSpan = typing.Optional[typing.Union['Span', 'SpanContext']]

opentelemetry-sdk/src/opentelemetry/sdk/__init__.py

@@ -12,8 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from . import trace
-from . import util
+from . import trace, util
 
 __all__ = [
     "trace",

opentelemetry-sdk/src/opentelemetry/sdk/trace/__init__.py

@@ -13,9 +13,7 @@
 # limitations under the License.
 
 
-from collections import OrderedDict
-from collections import deque
-from collections import namedtuple
+from collections import OrderedDict, deque, namedtuple
 from contextlib import contextmanager
 import random
 import threading