ndnSIM

Reported by Saran Tarnoi

I found an error when I was playing with a modified scenario of ndn-simple-with-content-freshness.cc.

assert failed. cond="tAbsolute >= TimeStep (m_currentTs)", file=../src/core/model/default-simulator-impl.cc, line=227
terminate called without an active exception

It seems to me that something went wrong about replacement policy and Freshness value.
The problem occurs when there are 2 producers with Freshness > 0 and the number of cached content objects reaches the cache size.

The scenario file attached