lfs: strip the response headers from the Batch API before printing

For reasons unknown, py3 is adding an extra '\n' before the headers print out.
This makes the output the same as py2.

hgext/lfs/blobstore.py

@@ -329,7 +329,7 b' class _gitlfsremote(object):'
         if self.ui.debugflag:
             self.ui.debug(b'Status: %d\n' % rsp.status)
             # lfs-test-server and hg serve return headers in different order
-            headers = pycompat.bytestr(rsp.info())
+            headers = pycompat.bytestr(rsp.info()).strip()
             self.ui.debug(b'%s\n'
                           % b'\n'.join(sorted(headers.splitlines())))
 
@@ -440,7 +440,7 b' class _gitlfsremote(object):'
                     ui.debug(b'Status: %d\n' % req.status)
                     # lfs-test-server and hg serve return headers in different
                     # order
-                    headers = pycompat.bytestr(req.info())
+                    headers = pycompat.bytestr(req.info()).strip()
                     ui.debug(b'%s\n'
                              % b'\n'.join(sorted(headers.splitlines())))