Compute Node parameters for input JSON - Overcloud

Following is an example of overcloud parameters:

"overcloud": {
						"can_start_address": "10.**.**.**",
						"can_end_address": "10.**.**.**",
						"internal_start_address": "10.**.**.**",
						"internal_end_address": "10.**.**.**",
						"storage_start_address": "10.**.**.**",
						"storage_end_address": "10.**.**.**",
						"password": "******",
						"storage_backend": [
							"ceph"
						]
					},

The following table defines each of the parameters:

Parameter	Description
`can_start_address`	Enter the first IP address of the available IP address range in the CAN network. NOTE: Four IP addresses are required for the CAN network.
`can_end_address`	Enter the last IP address of the available IP address range in the CAN network. NOTE: Four IP addresses are required for the CAN network.
`internal_start_address`	Enter the first IP address of the available IP address range in the CLM network. The range of the IP address is dependent on the number of nodes in the environment.
`internal_end_address`	Enter the last IP address of the available IP address range in the CLM network. The range of the IP address is dependent on the number of nodes in the environment.
`storage_start_address`	Enter the first IP address of the available IP address range in the BLS network. The range of the IP address is dependent on the number of nodes in the environment.
`storage_end_address`	Enter the last IP address of the available IP address range in the BLS network. The range of the IP address is dependent on the number of nodes in the environment.
`password`	To access the Overcloud nodes, enter the root password. NOTE: The root password must conform to following conventions: The minimum number of permissible characters is 7. The maximum number of permissible characters is 20. The password must contain at least 1 numeral. The password must contain at least 1 lowercase alphabet. The password must contain at least 1 uppercase alphabet.
`storage_backend`	Select the storage used for VIM. Values are ceph, nimble or hpe3par.