use maps.Equal instead of reflect.DeepEqual

[lrweck]

reflect causes a lot of memory allocations and uses more CPU time. maps.Equal does not cause any allocations and is about 80% faster

BenchmarkMapComparing/reflect.DeepEqual/10-8             1000000          1012 ns/op         320 B/op         30 allocs/op
BenchmarkMapComparing/maps.Equal/10-8                    7164884           170 ns/op           0 B/op          0 allocs/op
BenchmarkMapComparing/reflect.DeepEqual/20-8              629672          1899 ns/op         640 B/op         60 allocs/op
BenchmarkMapComparing/maps.Equal/20-8                    4098136           350 ns/op           0 B/op          0 allocs/op
BenchmarkMapComparing/reflect.DeepEqual/40-8              279854          3835 ns/op        1280 B/op        120 allocs/op
BenchmarkMapComparing/maps.Equal/40-8                    1950439           611 ns/op           0 B/op          0 allocs/op
BenchmarkMapComparing/reflect.DeepEqual/80-8              161636          7361 ns/op        2560 B/op        240 allocs/op
BenchmarkMapComparing/maps.Equal/80-8                    1000000          1157 ns/op           0 B/op          0 allocs/op
BenchmarkMapComparing/reflect.DeepEqual/100-8             128911          9429 ns/op        3200 B/op        300 allocs/op
BenchmarkMapComparing/maps.Equal/100-8                    840912          1421 ns/op           0 B/op          0 allocs/op
BenchmarkMapComparing/reflect.DeepEqual/200-8              65206         18791 ns/op        6400 B/op        600 allocs/op
BenchmarkMapComparing/maps.Equal/200-8                    424918          2888 ns/op           0 B/op          0 allocs/op
BenchmarkMapComparing/reflect.DeepEqual/400-8              33045         40529 ns/op       12800 B/op       1200 allocs/op
BenchmarkMapComparing/maps.Equal/400-8                    216856          5570 ns/op           0 B/op          0 allocs/op