fix(net/ghttp): Server Domain if is empty str, bind handler pattern will add @ which is not expect #4100

[elonnzhang]

#4100

[gqcn]

It might have something to do with the regular expression at

gf/net/ghttp/ghttp_server.go

Line 367 in 00e2f6b

array, _ := gregex.MatchString(`(.*?)%([A-Z]+):(.+)@(.+)`, k)

The regular expression might better be (.*?)%([A-Z]+):(.+?)@(.+).
You also need commit associated unit testing case for this update.