updates to dragonfly custom: selecting one path among multiple available to avoid intra-group congestion, enabling multiple connections within a router row, fixing lp-io radix bug

Slim fly updates and fixes

See merge request !17

Fixed fat-tree model seg fault

See merge request !18

 - net_events matches for synch=1,2,3 modes
 - fixed reverse event handler for kick_off_event()

 - Updated from copy function to rc_stack
 - Minor updates to chunk hash tracking
 - Removed bitfield from get_output_port(), credit_send() and
do_adaptive_routing() functions
 - Bug fix for saving output port and channel in router_packet_send
forward and reverse event handlers

Need to cut down synthetic dragonfly network size, currently running out of memory on jenkins server (commenting the test for now)

 - slim_packet_generate()
 - slim_packet_send()

Updating base fat tree synthetic .conf

See merge request !16