[refactor] replace boost smart ptr with stl (#6856)

1. replace all boost::shared_ptr to std::shared_ptr
2. replace all boost::scopted_ptr to std::unique_ptr
3. replace all boost::scoped_array to std::unique<T[]>
4. replace all boost:thread to std::thread

be/test/util/string_parser_test.cpp

@@ -97,7 +97,7 @@ void test_float_value(const std::string& s, StringParser::ParseResult exp_result
     EXPECT_EQ(exp_result, result);
 
     if (exp_result == StringParser::PARSE_SUCCESS && result == exp_result) {
-        T exp_val = strtod(s.c_str(), NULL);
+        T exp_val = strtod(s.c_str(), nullptr);
         EXPECT_EQ(exp_val, val);
     }
 }