gsutil crashes on reset connection

Sample stack trace from build automation:

Traceback (most recent call last):
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gsutil", line 22, in
gsutil.RunMain()
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gsutil.py", line 115, in RunMain
sys.exit(gslib.__main__.main())
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/__main__.py", line 385, in main
perf_trace_token=perf_trace_token, user_project=user_project)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/__main__.py", line 571, in _RunNamedCommandAndHandleExceptions
user_project=user_project)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/command_runner.py", line 319, in RunNamedCommand
return_code = command_inst.RunCommand()
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/commands/cp.py", line 1115, in RunCommand
cat_out_fd=cat_out_fd)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/cat_helper.py", line 140, in CatUrlStrings
provider=storage_url.scheme)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/cloud_api_delegator.py", line 277, in GetObjectMedia
decryption_tuple=decryption_tuple)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/gcs_json_api.py", line 998, in GetObjectMedia
decryption_tuple=decryption_tuple)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/gcs_json_api.py", line 1087, in _PerformDownload
additional_headers=additional_headers, use_chunks=False)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/third_party/apitools/apitools/base/py/transfer.py", line 524, in StreamMedia
additional_headers=additional_headers)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/third_party/apitools/apitools/base/py/transfer.py", line 413, in __GetChunk
retries=self.num_retries)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/third_party/apitools/apitools/base/py/http_wrapper.py", line 356, in MakeRequest
max_retry_wait, total_wait_sec))
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/util.py", line 1777, in RetriesInDataTransferHandler
http_wrapper.RethrowExceptionHandler(retry_args)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/third_party/apitools/apitools/base/py/http_wrapper.py", line 346, in MakeRequest
check_response_func=check_response_func)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/third_party/apitools/apitools/base/py/http_wrapper.py", line 396, in _MakeRequestNoRetry
redirections=redirections, connection_type=connection_type)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/gcs_json_media.py", line 502, in NewRequest
connection_type=connection_type)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/third_party/oauth2client/oauth2client/transport.py", line 175, in new_request
redirections, connection_type)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/third_party/oauth2client/oauth2client/transport.py", line 282, in request
connection_type=connection_type)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/third_party/httplib2/python2/httplib2/__init__.py", line 1659, in request
(response, content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/gcs_json_media.py", line 409, in OverrideRequest
headers)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/gcs_json_media.py", line 641, in _conn_request
new_data = http_stream.read(TRANSFER_BUFFER_SIZE)
File "chromium/src/third_party/depot_tools/external_bin/gsutil/gsutil_4.30/gsutil/gslib/gcs_json_media.py", line 361, in read
data = orig_read_func(amt)
File "/usr/lib/python2.7/httplib.py", line 597, in read
s = self.fp.read(amt)
File "/usr/lib/python2.7/socket.py", line 384, in read
data = self._sock.recv(left)
File "/usr/lib/python2.7/ssl.py", line 772, in recv
return self.read(buflen)
File "/usr/lib/python2.7/ssl.py", line 659, in read
v = self._sslobj.read(len)
socket.error: [Errno 104] Connection reset by peer

Start with gslib/gcs_json_media.py around _conn_request and read, then follow the retry path through apitools/base/py/http_wrapper.py and gslib/util.py. Reproduce the build-automation download scenario from the stack trace and determine how a reset connection should be handled; done means the command no longer crashes unexpectedly in that case.

Written by the indexing model from the issue text.