When RttMonRttType is 'pathEcho' this is the maximum
number of statistics hops to record per path group.
This value directly represents the number of hops along
a path to a target, thus we can only support 30 hops.
For all other RttMonRttTypes this value will be
forced to one by the agent.
Since this index does not rollover, only the first
rttMonStatisticsAdminNumHops will be kept. This object
is applicable to pathEcho probes only.