client: store image cache data in database

Parse the 'cache' field of the refresh payload sent by the clients.

Cache field structure in the payload:
{
    ...
    'cache': [
        {'name': 'windows.img', 'size': 2432370213, checksum: '5d4dcc677bc19f40a647d0002f4ade90'},
        {'name': 'linux.img', 'size': 243234534213, checksum: '3eb22f888f88a55ad954f55644e1192e'},
    ]
    ...
}

Store that data in the 'cache' table of the  database so it can
be obtained later on.
The table contains the following fields:
- clientid: the numeric identifier of the client.
- imagename: name of the image in cache.
- size: size in bytes of the image in cache.
- checksum: checksum of the image in cache.

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