MTT - server prestate should contain also args.threads_num

[Tomasz Gromadzki]

MTT connection server prestate should contain also args.threads_num
It allows controlling precisely how many clients the server should wait.

rpma/tests/multithreaded/conn/rpma_common.c

Line 230 in c1cdf72

 struct server_prestate server_prestate = {args.addr, args.port};