datasources vcd_resource_list and vcd_resource_schema

[dataclouder]

vcd_resource_list

• List deployed resources by name, ID,or HREF
• List deployed resources with import command

data source gives information about VCD, with a list of available resources, in several formats.

data "vcd_resource_list" "list_of_orgs" {
  name          = "list_of_orgs"
  resource_type = "org"
  list_mode     = "name_id"
}

// Shows the list of organizations with the corresponding ID
output "org_list" {
  value = data.vcd_resource_list.list_of_orgs.list
}

vcd_resource_schema

• Shows the structure of any resource in terraform-provider-vcd

data "vcd_resource_schema" "net_struct" {
  name "net_struct"
  resource_type = "vcd_network_isolated"
}

// Shows the structure of resource network_isolated
output "net_struct" {
  value = data.vcd_resource_schema.net_struct
}

More examples in the docs page.
This PR resumes work started in PR #415

[Didainius]

Great things with immediate use cases now:)

A few general comments on docs:

• Looks like HCL examples don't like // for comments when highlighting ( at least the old engine). I think default HCL comment # should reender it better:

• Given that it is not a standard resource maybe "Example Usage 1...n" headers could have titles. Like "Example Usage 1 (List all organizations)" instead of just "Example Usage 1":

[Didainius]

I am missing a bit more docs and it is not immediately clear what should be provided. Might be that name parent_name could be easier to grasp. Also some examples in docs could use this method.

[dataclouder]

I have added some examples in the docs

[vbauzys]

LGTM. I know we are not experts in HCL scripting, but it would be good to figure out for ourselves and for others to write in documentation(examples) for e.g. how to take out value from this data and use in next resource:

output: 
list_networks_hierarchy = [
  "datacloud  vdc-datacloud  net-datacloud-r",
  "datacloud  vdc-datacloud  net-datacloud-i",
  "datacloud  vdc-datacloud  net-datacloud-r2",
  "datacloud  vdc-datacloud  net-datacloud-d",
]

[lvirbalas]

One tiny thing and one huge question.

[lvirbalas]

Looks good now and very useful!