Adding fat tree replay file

src/network-workloads/conf/modelnet-mpi-fattree-summit-k36-n3564.conf

+LPGROUPS
+{
+   MODELNET_GRP
+   {
+      repetitions="198";     # repetitions = Ne = total # of edge switches. For type0 Ne = Np*Ns = ceil(N/Ns*(k/2))*(k/2) = ceil(N/(k/2)^2)*(k/2)
+      nw-lp="18";
+      modelnet_fattree="18";
+      fattree_switch="3";
+   }
+}
+PARAMS
+{
+   ft_type="0";
+   packet_size="512";
+   message_size="592";
+   chunk_size="32";
+   modelnet_scheduler="fcfs";
+   #modelnet_scheduler="round-robin";
+   modelnet_order=( "fattree" );
+   num_levels="3";
+   switch_count="198";       # = repititions
+   switch_radix="36";
+   router_delay="60";
+   soft_delay="1000";
+   vc_size="65536";
+   cn_vc_size="65536";
+   link_bandwidth="12.5";
+   cn_bandwidth="12.5";
+}