replace STRING to name_label for zone's name

[liwenhui-soul]

till now, we should use STRING to represent a zone,
e.g. create space test (...) on "zone1","zone2" , we should always use double quotation mark, the original reason of using STRING is to handle some illegal name like "127.0.0.1zone_1111", and this pr #3424 could solve the problem. for legal name, we don't need to use double quotation mark.
e.g create space test (...) on zone1, zone2
and for illegal name, we could do it like this
create space test (...) on `127.0.0.1zone_1111`, `127.0.0.1zone_2222`

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