[issue1923] meaningful whitespace can be lost in rfc822_escape

Stephen Emslie added the comment: Here's that keeps the whitespace in tact, along with a simple test. This doesn't patch docs as the existing documentation_ already describes the long string as multiple lines of "plain text in reStructuredText format", whic

[issue1923] meaningful whitespace can be lost in rfc822_escape

New submission from Stephen Emslie: distutils.util.rfc822_escape strips each line of its whitespace before indenting, but this can mean losing meaningful whitespace, such as in reStructuredText. distutils uses rfc822_escape to escape fields in metadata, such as PKG-INFO. This unfortunately