vm Instance Count
  The number of nodes in the node type. 
Values: 
-1 - Use when auto scale rules are configured or sku.capacity is defined 
 0 - Not supported 
>0 - Use for manual scale.
The number of nodes in the node type. 
Values: 
-1 - Use when auto scale rules are configured or sku.capacity is defined 
 0 - Not supported 
>0 - Use for manual scale.