[3.7] bpo-34226: fix cgi.parse_multipart without content_length (GH-8530) #20892
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In Python 3.7 the behavior of parse_multipart changed requiring CONTENT-LENGTH
header, this fix remove this header as required and fix FieldStorage
read_lines_to_outerboundary, by not using limit when it's negative,
since by default it's -1 if not content-length and keeps substracting what
was read from the file object.
Also added a test case for this problem.
(cherry picked from commit d8cf351)
Co-authored-by: roger rogerduran@gmail.com
https://bugs.python.org/issue34226
Automerge-Triggered-By: @ned-deily