[FIX] Sieve rule got overwritten
[FIX] Sieve rule got overwritten

Sieve file is cached & got overwritten. Now we initialize
a new variable & dont overwrite sieve file.

Signed-off-by: Sebastian Waldbauer <92c8947de9445098797f7157643dd3fa3f45d8ca@cert.at>

aaronkaplan/intelmq,certtools/intelmq,aaronkaplan/intelmq,certtools/intelmq,certtools/intelmq,aaronkaplan/intelmq