Refs #100905  If the predicted response time gets very small, randomize timing of alternatives.
Refs #100905  If the predicted response time gets very small, randomize timing of alternatives.

This is to try to prevent the alternatives from being tried too often
or too seldom.  Without this, test_spur_traffic was failing fairly often
on one test machine, with too much spur traffic.

svartika/ccnx,cawka/ndnx,svartika/ccnx,cawka/ndnx,svartika/ccnx,cawka/ndnx,svartika/ccnx,svartika/ccnx,svartika/ccnx,cawka/ndnx,cawka/ndnx,svartika/ccnx