[3.2] fixed compile warnings in abi_tests.cpp (real bug, missing test), auth_tests.cpp, bootseq_tests.cpp, and whitelist_blacklist_tests.cpp

[linh2931]

Resolved #632.

The warning for abi_tests.cpp was a real bug. The test case missed actual check. The warnings fixed were

/home/lh/work/warning/unittests/abi_tests.cpp: In member function ‘void abi_tests::abi_account_name_in_eosio_abi::test_method()’:
/home/lh/work/warning/unittests/abi_tests.cpp:2058:9: warning: variable ‘is_type_exception’ set but not used [-Wunused-but-set-variable]
 2058 |    auto is_type_exception = [](fc::assert_exception const & e) -> bool { return e.to_detail_string().find("abi.types.size") != std::string::npos; };
      |         ^~~~~~~~~~~~~~~~~

/home/lh/work/warning/unittests/bootseq_tests.cpp: In member function ‘void bootseq_tests::bootseq_test::test_method()’:
/home/lh/work/warning/unittests/bootseq_tests.cpp:328:20: warning: variable ‘first_june_2018’ set but not used [-Wunused-but-set-variable]
  328 |         const auto first_june_2018 = fc::seconds(1527811200); // 2018-06-01
      |                    ^~~~~~~~~~~~~~~

/home/lh/work/warning/unittests/auth_tests.cpp: In member function ‘void auth_tests::any_auth::test_method()’:
/home/lh/work/warning/unittests/auth_tests.cpp:344:15: warning: variable ‘bob_spending_priv_key’ set but not used [-Wunused-but-set-variable]
  344 |    const auto bob_spending_priv_key = chain.get_private_key(name("bob"), "spending");
      |               ^~~~~~~~~~~~~~~~~~~~~

/home/lh/work/warning/unittests/whitelist_blacklist_tests.cpp: In member function ‘void whitelist_blacklist_tests::greylist_limit_tests::test_method()’:
/home/lh/work/warning/unittests/whitelist_blacklist_tests.cpp:807:71: warning: comparison of integer expressions of different signedness: ‘int64_t’ {aka ‘long int’} and ‘long unsigned int’ [-Wsign-compare]
  807 |    BOOST_REQUIRE( rm.get_account_net_limit_ex(user_account).first.max > 3*reqauth_net_charge );
      |                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/home/lh/work/warning/unittests/whitelist_blacklist_tests.cpp:808:71: warning: comparison of integer expressions of different signedness: ‘int64_t’ {aka ‘long int’} and ‘long unsigned int’ [-Wsign-compare]
  808 |    BOOST_REQUIRE( rm.get_account_net_limit_ex(user_account).first.max < 4*reqauth_net_charge );
      |                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/home/lh/work/warning/unittests/whitelist_blacklist_tests.cpp:851:43: warning: comparison of integer expressions of different signedness: ‘long unsigned int’ and ‘int64_t’ {aka ‘long int’} [-Wsign-compare]
  851 |       BOOST_REQUIRE( 2*reqauth_net_charge < user_net_res2.first.max );
      |                      ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/home/lh/work/warning/unittests/whitelist_blacklist_tests.cpp:852:46: warning: comparison of integer expressions of different signedness: ‘int64_t’ {aka ‘long int’} and ‘long unsigned int’ [-Wsign-compare]
  852 |       BOOST_REQUIRE( user_net_res2.first.max < 3*reqauth_net_charge );
      |                      ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~