Update Zlog valid schemes

[SalmaElsoly]

update Zlog valid schemes to accept http or https to support using loki with tailstream
threefoldtech/tailstream#3

https://github.com/threefoldtech/zosbase/blob/b53aa00fee38ff5013d2ca26ec107ee37f89a1a1/pkg/gridtypes/zos/zlogs.go#L38