fix(bm-nic): added check for 0.0.0.0 reserved ip on nic availability

[ujjwal-ibm]

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Relates OR Closes #0000

Output from acceptance testing:

=== RUN   TestAccIBMISBareMetalServerNetworkInterfaceAllowFloat_rip_basic
--- PASS: TestAccIBMISBareMetalServerNetworkInterfaceAllowFloat_rip_basic (59.70s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     62.540s

=== RUN   TestAccIBMISBareMetalServerNetworkInterfaceAllowFloat_basic
--- PASS: TestAccIBMISBareMetalServerNetworkInterfaceAllowFloat_basic (44.58s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     46.873s

[ujjwal-ibm]

#4114