[issue-85] Drift in state file

[Prativa20]

Added pagination in resource read to fetch all VMs in a deployment to fix #85
Modified the schema, README and the doc is updated with the changes.

NOTE: The schema has been modified. With this change, the .tf files needs no modification, but the state file will have a few changes in the resource_configuration block. This will require the outputs to be modified according to the new state file.

Following is a brief summary of state file modifications:

resource_configuration: [
     "component_name" = "Machine1"
     "cluster" = 2
     "configuration" : {
          "cpu"= 2
          "memory" = 1024
     }
     // this has been renamed from resource_state to instances. resource_state was a map, but instances is a list
     // it is a list of all VMs in the above cluster. each element in an instance represents a VM and its properties
     instances: [
          {
               "resource_id" : <some_id>,
               "name" : Machine1-2000,
               " ip_address" : 10.xxx.xxx.xxx,
               "properties" : {
                    "cpu" : 2
                    "memory" : 1024,
                    "storage" : 8,
                    "ChangeLease": "true",
                    "ChangeOwner": "true",
                    "Component": "vSphere2",
                    "machineId": "4678efa4-1ccn8-457f-b5ee-ed73727decc9",
                    // all other properties returned by vRA
             },
            {
               "resource_id" : <some_id>,
               "name" : Machine1-2001,
               " ip_address" : 10.xxx.xxx.xxx,
               "properties" : {
                    "cpu" : 2
                    "memory" : 1024,
                    "storage" : 8,
                    "ChangeLease": "true",
                    "ChangeOwner": "true",
                    "Component": "vSphere2",
                    "machineId": "4678efa4-14b8-457f-b5ee-edhgf27decc9",
                    // all other properties returned by vRA
             }
          } 
     ]
]

Signed-off-by: Prativa Bawri bawrip@vmware.com

[markpeek]

LGTM