vRtrPimNgIfThreeWayHello specifies whether to enable or disable
the three way hello.
For all interfaces, the default value is 'disabled'. It specifies that
the standard two way hello is supported. When the value is set to
'enabled' it specifies that the three way hello is supported. However
this will not be compatible with releases 3.0R10, 3.0R11, 4.0R2 and
4.0R3.