General lack of IPv6 support in this extension

[ggiesen]

Even though vSphere has had IPv6 support with near-parity to IPv4 since at least 6.0 (see vSphere IPv6 Connectivity), this extension seems to not support it at all.

Examples:

saltext.vmware.modules.esxi.create_vmkernel_adapter: No support for setting IPv6 default gateway, IPv6 network type, IPv6 address, IPv6 prefix

saltext.vmware.modules.esxi.update_vmkernel_adapter: No support for updating IPv6 default gateway, IPv6 network type, IPv6 address, IPv6 prefix

saltext.vmware.states.esxi.vmkernel_adapter_present: No support for setting IPv6 default gateway, IPv6 network type, IPv6 address, IPv6 prefix