aci-test: don't set Isolators for now
aci-test: don't set Isolators for now

Unfortunately the APPC manifest source code files cannot be deserialized
from YAML in a trivial way: The Isolators can assume more than one format.
(They are stored as json.RawData, and the used library does not support
that.) Not suppressing them in tests results in a nil-pointer exception.

wmark/blablacar-dgr,wmark/blablacar-dgr