Add 'list_host' command in 'nova-manage cell_v2'

Registered by keerthivasan selvaraj

Description
===========
Currently I am not able to list the compute_nodes present under single cell using nova-manage. Only way to check the available compute_nodes under specific cell is from the host_mappings table.

Steps to reproduce
==================

* nova-manage cell_v2 list_hosts --cell_uuid <cell-uuid>
* No method found

Expected result
===============
nova-manage cell_v2 list_hosts --cell_uuid 1794f657-d8e9-41ad-bff7-01b284b55a9b

+----+----------+-----------+
| Id | Host | Cell Name |
+----+----------+-----------+
| 2 | compute2 | cell2 |
+----+----------+-----------+

Actual result
=============
No such method (list_hosts) found from nova-manage

Environment
===========

Using Devstack stable/pike, nova-manage (16.0.3 ).

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
keerthivasan selvaraj
Direction:
Needs approval
Assignee:
keerthivasan selvaraj
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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