This change deprecates vsphere_guest in favor of vmware_guest and other
related modules.
The major reasons behind deprecation are -
- Pysphere - Unofficial Python bindings of vCenter deprecated in the year 2013.
- VMware provides official Python bindings for vCenter, which is used in vmware_guest.
- vcsim - simulator used in integration testing of vmware module does not support PySphere
APIs, which makes it more difficult to test vsphere_guest.
Please see [deprecation plan](https://github.com/ansible/community/wiki/VMware%3A-vsphere_guest_deprecation)
Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>