rest: add cache/list

Add GET cache/list request to obtain information about the client's
cache.

Resquest payload structure:
{
    'clients': ['10.141.10.21', '10.141.10.22']
}

Response's structure:
{
    'clients': [
        {
            'ip': '10.141.10.21',
            'cache_size': 2894572304857,
            'images': [
                {name:'img1', size: 87283902343, checksum: '5d4dcc677bc19f40a647d0002f4ade90'},
                {name:'img2', size: 894572304857, checksum: '3eb22f888f88a55ad954f55644e1192e'}
            ]
        },
        {
            'ip': '10.141.10.22',
            'cache_size': 49872839023434,
            'images': [
                {name:'img2', size: 894572304857, checksum: '3eb22f888f88a55ad954f55644e1192e'}
            ]
        }
    ]
}

Both 'cache_size' and the values in 'image_sizes' are provided
as bytes.

If a client has no cache partition the payload will include it as:
...
	{
            'ip': '10.141.10.22',
            'cache_size': 0,
            'images': []
        }
...

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