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exim: temp hack to stop exim when on fermium

Authored by Dzahn.

Description

exim: temp hack to stop exim when on fermium

Add an ugly but temp. hack to ensure exim is NOT running
when on fermium but leave it unchanged on all other hosts (sodium).

This is to be able to apply the puppet role and test it for the migration
without having exim send out any emails.

Bug:T109925
Change-Id: I1e336990d6e836c8b3a4c5da3530eabfebbf57f5