This object is used to control the preserving of statistics when a policy
is attached to an interface that already has a policy attachment.
Set this object to true to preserve statistics.
Get and GetNext will always return false.
This object may be modified while the row is active. The desired value
must be set before the policy is attached or in a multiple object
varbind. Failure to do so will result in the policy being attached with
the previous value of juniPolicyIfAttachStatsPreserve.