Merge pull request #2893 from jboeuf/fix_clock_in_jwt_verifier

Fixing clock type for JWT verifier tool.

test/core/security/verify_jwt.c

@@ -112,7 +112,7 @@ int main(int argc, char **argv) {
   while (!sync.is_done) {
     grpc_pollset_worker worker;
     grpc_pollset_work(&sync.pollset, &worker,
-                      gpr_inf_future(GPR_CLOCK_REALTIME));
+                      gpr_inf_future(GPR_CLOCK_MONOTONIC));
   }
   gpr_mu_unlock(GRPC_POLLSET_MU(&sync.pollset));