change from installkeys to installkey

when you have two rdiff-backup calls, then the User is a Duplicate
definition, i think the only way to do it is to have a variable that
you can set to turn off user handling (which we make $installuser and
$usermanage be consistant with $installkey and $keymanage), which is
set true by default, but when you have a second rdiff call on a host,
you can set it to false

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