Set ulimit -n in the docker

docker/start-docker

@@ -5,4 +5,5 @@
 
 docker run -d --cap-add SYS_NICE --rm --device /dev/sgx_enclave \
     --device /dev/sgx_provision --name ${TEEMS_DOCKER_PREFIX}teems \
+    --ulimit nofile=10485760:10485760 \
     -h ${TEEMS_DOCKER_PREFIX}teems -t ${TEEMS_DOCKER_PREFIX}teems bash