bat_hosts: fixes rpcd error

[javierbrk]

Rpcd get bat hosts call was not working causing lime app UI to fail when trying to retrieve host names.

This pull request fixes the rpc call.

the function "bat_hosts.get_bat_hosts_from_shared_state()" was created for testing purposes.

 ubus call bat-hosts get_bathost '{"mac":"AE:40:41:1C:85:16"}'
{
        "status": "ok",
        "bathost": {
                "iface": "wlan1-mesh_17",
                "hostname": "LiMe-8037b1"
        }
}

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.79%. Comparing base (069ac1a) to head (29822ca).

:exclamation: Current head 29822ca differs from pull request most recent head d7a3873. Consider uploading reports for the commit d7a3873 to get more accurate results

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1094 +/- ## ========================================== + Coverage 79.69% 79.79% +0.10% ========================================== Files 53 53 Lines 4576 4574 -2 ========================================== + Hits 3647 3650 +3 + Misses 929 924 -5 ```

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[G10h4ck]

shouldn't lime-app ported to shared-state-async ubus interface instead? so we can drop this plugin altogether?

[javierbrk]

this is just a quick fix to #1093 It will bring consistency to the limeapp version linked in the repository. I think that the other alternative requires a new release of the lime app.