message: Use default gas limit (500k)
diff: @@ -241,7 +241,6 @@ mod singlepass_tests {
  use cosmwasm_std::to_vec;
  use cosmwasm_vm::call_handle;
  - use cosmwasm_vm::testing::mock_instance_with_gas_limit;
  fn make_init_msg() -> (InitMsg, HumanAddr) {
  let verifier = HumanAddr::from("verifies");
  @@ -278,8 +277,7 @@ mod singlepass_tests {
  #[test]
  fn handle_cpu_loop() {
  - // Gas must be set so we die early on infinite loop
  - let mut deps = mock_instance_with_gas_limit(WASM, &[], 1_000_000);
  + let mut deps = mock_instance(WASM);
  let (init_msg, creator) = make_init_msg();
  let init_env = mock_env(&deps.api, creator.as_str(), &[], &[]);
  @@ -299,8 +297,7 @@ mod singlepass_tests {
  #[test]
  fn handle_storage_loop() {
  - // Gas must be set so we die early on infinite loop
  - let mut deps = mock_instance_with_gas_limit(WASM, &[], 1_000_000);
  + let mut deps = mock_instance(WASM);
  let (init_msg, creator) = make_init_msg();
  let init_env = mock_env(&deps.api, creator.as_str(), &[], &[]);
  @@ -320,8 +317,7 @@ mod singlepass_tests {
  #[test]
  fn handle_memory_loop() {
  - // Gas must be set so we die early on infinite loop
  - let mut deps = mock_instance_with_gas_limit(WASM, &[], 1_000_000);
  + let mut deps = mock_instance(WASM);
  let (init_msg, creator) = make_init_msg();
  let init_env = mock_env(&deps.api, creator.as_str(), &[], &[]);
  