Add NetworkID

[michaelkad]

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'
--- PASS: TestAccIBMPINetworkPortDataSource_basic (37.01s)
PASS
--- PASS: TestAccIBMPINetworkDataSource_basic (57.51s)
PASS

User will get this error if they provide both arguments.
Error: Conflicting configuration arguments
	with data.ibm_pi_network.testacc_ds_network, 
	on terraform_plugin_test.tf line 5, in data "ibm_pi_network"   "testacc_ds_network": 5: pi_network_id = "0095fe96-d919-4d68-be3a-1844db3de4ce"

	"pi_network_id": conflicts with pi_network_name
Error: Conflicting configuration arguments
	with data.ibm_pi_network.testacc_ds_network, on terraform_plugin_test.tf line 6, in data "ibm_pi_network" "testacc_ds_network": 6: pi_network_name = "net_sample3-3340"
	"pi_network_name": conflicts with pi_network_id
...

[ismirlia]

lgtm

[ismirlia]

Oh one more thing, you may have to reinstate this field. We probably still need an attribute to display the name of the network somewhere.

            Attr_Name: {
				Computed:    true,
				Deprecated:  "This field is deprecated, use pi_network_name instead.",
				Description: "The unique identifier or name of a network.",
				Type:        schema.TypeString,
			},

[ismirlia]

lgtm