Granular CRN for dedicated hosts

[Alexander-Kita]

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Relates OR Closes #0000

Output from acceptance testing:

pi_host (r)

=== RUN   TestAccIBMIHostBasic
--- PASS: TestAccIBMIHostBasic (77.36s)
PASS

=== RUN   TestAccIBMIHostUserTags
--- PASS: TestAccIBMIHostUserTags (109.45s)
PASS

pi_host_group (r)

=== RUN   TestAccIBMPIHostGroupBasic
--- PASS: TestAccIBMPIHostGroupBasic (66.91s)
PASS

pi_host (d)

=== RUN   TestAccIBMPIHostDataSourceBasic
--- PASS: TestAccIBMPIHostDataSourceBasic (40.21s)
PASS

pi_hosts (d)

=== RUN   TestAccIBMPIHostsDataSourceBasic
--- PASS: TestAccIBMPIHostsDataSourceBasic (43.91s)
PASS