Implement resources for managing VMware vSphere environments about gru

[dnaeon]

Datacenter support landed on the master branch.

Example Lua code for managing vSphere Datacenters:

-- Create ten VMware vSphere datacenters
for i=1, 10 do
   dc = vsphere.datacenter.new("test-datacenter-" .. i)
   dc.username = "root"
   dc.password = "myp4ssw0rd"
   dc.endpoint = "https://vc01.example.org/sdk"
   dc.state = "present"

   catalog:add(dc)
end

[dnaeon]

Support for managing vSphere clusters has been implemented.

Example usage:

cluster = vsphere.cluster.new("my-cluster")
cluster.endpoint = "https://vc01.example.org/sdk"
cluster.username = "root"
cluster.password = "myp4ssw0rd"
cluster.folder = "/MyDatacenter/host"
cluster.state = "present"

-- DRS settings for the cluster
cluster.drs_enable = true
cluster.drs_behavior = "fullyAutomated"

[dnaeon]

Initial vSphere support has been implemented in master branch.