vSphere UPI - Network module and updated ign customization

[dav1x]

1. Added a dynamic external datasource for customizing IP ranges for vSphere clusters. Will check ICMP then return 3 lists of IPs based on the worker/master count.
2. Removed vsphere guest customizations and added field for guestinfo.coreos.config.data.

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@dav1x: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/prow/shellcheck	bbb0f9b	link	/test shellcheck

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[dav1x]

Closed in favor of #1502