Fix broken builds due to minor errors in examples/rdma/simpleRdma
After merging the SDAG change related to RDMA (https://charm.cs.illinois.edu/gerrit/#/c/2572/), the nightly build ran the rdma examples (as previously, the makefile wasn't updated and the rdma examples were never run). During the first test of rdma examples on all the builds, targets related to bigsim and windows broke because of different reasons. (http://charm.cs.illinois.edu/autobuild/old.2017_06_15__01_00/)
Bigsim build (netlrts-linux-x86_64-bigsim) broke because of an incorrect makefile. Fix: Remove rdma examples from bigsim tests.
Windows builds broke because of a call to the time function from the simpleRdma example. Fix: Remove the time call (and even the srand call where time() is passed).