drop ellipsis assignments from module vars, classvars and instance attrs (#5914)

Signed-off-by: oleg.hoefling <oleg.hoefling@gmail.com>

stdlib/asyncio/constants.pyi

@@ -9,6 +9,6 @@ if sys.version_info >= (3, 7):
     SENDFILE_FALLBACK_READBUFFER_SIZE: int
 
 class _SendfileMode(enum.Enum):
-    UNSUPPORTED: int = ...
-    TRY_NATIVE: int = ...
-    FALLBACK: int = ...
+    UNSUPPORTED: int
+    TRY_NATIVE: int
+    FALLBACK: int

stdlib/asyncio/events.pyi

@@ -66,7 +66,7 @@ class AbstractServer:
     async def wait_closed(self) -> None: ...
 
 class AbstractEventLoop(metaclass=ABCMeta):
-    slow_callback_duration: float = ...
+    slow_callback_duration: float
     @abstractmethod
     def run_forever(self) -> None: ...
     # Can't use a union, see mypy issue  # 1873.

stdlib/asyncio/proactor_events.pyi

@@ -65,7 +65,7 @@ class _ProactorDuplexPipeTransport(_ProactorReadPipeTransport, _ProactorBaseWrit
 
 class _ProactorSocketTransport(_ProactorReadPipeTransport, _ProactorBaseWritePipeTransport, transports.Transport):
 
-    _sendfile_compatible: constants._SendfileMode = ...
+    _sendfile_compatible: constants._SendfileMode
     def __init__(
         self,
         loop: events.AbstractEventLoop,