If the value in 'localField' is an array, assume that it corresponds to
multiple entries in the foreign collection. The query to the foreign
collection will use a $in predicate, except when a regex is present, in
which case it will use a series of $eq predicates within an $or.
The default ShardingTest verbosity is currently zero, but we have many
tests, which bump it to 1 and even higher.
Since verbosity level of 0 is sometimes insufficient for investigating
transient failures, this change makes the default to be 1 and removes all
places, which explicitly make it 1 or higher.
