Add license to files inside tests folder

tests/api_tests/api_tests.cpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 #include <algorithm>
 #include <random>
 #include <iostream>

tests/api_tests/extended_memory_test/extended_memory_test.cpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 #include <eoslib/message.h>
 //#include <eoslib/types.hpp>
 #include <eoslib/memory.hpp>

tests/api_tests/memory_test/memory_test.cpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 #include <eoslib/message.h>
 //#include <eoslib/types.hpp>
 #include <eoslib/memory.hpp>

tests/api_tests/memory_test/memory_test.hpp

 
+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 namespace memory_test {
 
 } /// namespace memory_test

tests/common/macro_support.hpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 #pragma once
 
 #include <fc/crypto/digest.hpp>

tests/common/testing_macros.hpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 #pragma once
 
 #include <eos/chain/wast_to_wasm.hpp>

tests/slow_tests/wast/loop.cpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 extern "C" {
 typedef long long    uint64_t;
 typedef unsigned int uint32_t;

tests/slow_tests/wast/simplecoin.cpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 extern "C" {
 typedef long long    uint64_t;
 typedef unsigned int uint32_t;

tests/tests/abi_tests.cpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 #include <algorithm>
 #include <vector>
 #include <iterator>

tests/tests/chain_tests.cpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 #include <boost/test/unit_test.hpp>
 
 #include <eos/chain/chain_controller.hpp>

tests/tests/misc_tests.cpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 #include <eos/chain/BlockchainConfiguration.hpp>
 #include <eos/chain/authority_checker.hpp>
 #include <eos/chain/authority.hpp>

tests/tests/native_contract_tests.cpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 #include <boost/test/unit_test.hpp>
 
 #include <eos/chain/chain_controller.hpp>

tests/tests/special_accounts_tests.cpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 #include <algorithm>
 #include <vector>
 #include <iterator>

tests/tests/types_tests.cpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 #include <eos/types/TypeParser.hpp>
 
 #include <boost/test/unit_test.hpp>

tests/tests/wallet_tests.cpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
 #include <eos/utilities/key_conversion.hpp>
 #include <eos/utilities/rand.hpp>
 #include <eos/wallet_plugin/wallet.hpp>