Solaris non posix date

[daroga0002]

Solaris 10 date command is POSIX compliant and doesn`t implement

date "+%s"

so in config.sh it can be replaced by

perl -e 'print time."\n";'

Line: https://github.com/leprechau/zfs-replicate/blob/17bf8fb57b51560b30abfae7f23aa19f1e8f9e4c/config.sample.sh#L78