[PATCH] Add option -e to swapon and swapoff

[René Rhéaume]

Hello,
I added the -e option to swapon and swapoff to match util-linux.
OpenRC on Linux requires this option in its swap init script. See
https://bugs.gentoo.org/show_bug.cgi?id=468598 for details.

There are three versions of the patch : for 1.20 and 1.21, for 1.22
and for the master branch.
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