requests: Unify BodyStream EOF error message.

Use one error string for Content-Length and chunked read paths to reduce
__init__.mpy size without changing behaviour.

Signed-off-by: Pablo Ventura <pablogventura@gmail.com>

Author: pablogventura

python-ecosys/requests/requests/__init__.py

@@ -16,7 +16,7 @@ def read(self, n=-1):
             data = self._sock.read(n)
             self._remaining -= len(data)
             if not data:
-                raise ValueError("Connection closed before Content-Length satisfied")
+                raise ValueError("Connection closed before body complete")
             return data
         buf = bytearray(n if n >= 0 else 256)
         result = b""