provider/openstack: Add 'value_specs' option to 'openstack_fw_rule_v1' resource

[fatmcgav]

Refactor to use common 'types.go' and 'MapValueSpecs' function.
Website docs updated.

[fatmcgav]

@jtopjian First of the value_spec additions to the openstack_fw_* resources :)

[jtopjian]

@fatmcgav The logic for "any" protocol needs to be added to the ToRuleCreateMap function:

https://github.com/gophercloud/gophercloud/blob/master/openstack/networking/v2/extensions/fwaas/rules/requests.go#L113-L124

I wonder if there's a way to trigger the "parent" function rather than copying custom logic like this.

[fatmcgav]

@jtopjian Ah, didn't spot that...

I'll get it added...
Calling the parent function would be nice, but I'd guess challenging, as I'm already doing a lot of the work in BuildRequest...

[fatmcgav]

@jtopjian OK, "any" protocol added to ToRuleCreateMap.

I've also checked the other openstack_fw resources, and there wasn't any others with custom CreateMap functionality... :)

[ghost]

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