gh-100001: Also escape \s in http.server log messages. (GH-100038)

Also \ escape \s in the http.server BaseHTTPRequestHandler.log_message so
that it is technically possible to parse the line and reconstruct what the
original data was.  Without this a \xHH is ambiguious as to if it is a hex
replacement we put in or the characters r"\x" came through in the original
request line.
(cherry picked from commit 7e29398407dbd53b714702abb89aa2fd7baca48a)

Co-authored-by: Gregory P. Smith <greg@krypto.org>