Fix ibm_pi_network and ibm_pi_network data source to use id

[michaelkad]

Add network name
Update doc
sync master

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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

...