We use current hostname as the element of the unique file name.
Sometimes there is non-/24 zone delegation,
{{{
$ host 144.206.233.65
65.233.206.144.in-addr.arpa is an alias for 65.26/64.233.206.144.in-addr.arpa.
}}}
as per RFC 2317,
https://www.rfc-editor.org/rfc/rfc2317.txt
So on Un*x systems we may run into having path separator inside
the file name. Not good, things will choke. Prevented this
by substituting all appeared path separators in the return value.
Signed-off-by: Eygene Ryabinkin <rea@codelabs.ru>
Tested-at: my MacOSX instance, my FreeBSD instances
3a807d0f2b