cli: add server commandsv0.3.1

Add OgServer class inside cli/objects/server.py

This OgServer class implements add, list, set and delete commands
related to the server API (/server and /client/server) exposed by the
ogServer. These server endpoints correspond with the "entornos" table and
"identorno" foreign key in the "ordenadores" tables.

To list all rows from the "entornos" table. i.e: Listing all stored
addresses for the ogServer:

	ogcli list servers

	{
	  "servers": [
	    {
	      "address": "192.168.2.240",
	      "id": 1
	    },
	    {
	      "address": "1.1.1.1",
	      "id": 2
	    }
	  ]
	}

To store a new ip address for the ogServer, ogCLI will reply with the
new id:

	ogcli add server --address "10.141.10.1"

	{"id", "2"}

To set a client's associated ogServer address using the server id:

	ogcli set server --id 2 --client-ip 10.141.10.100

To set the associated server of a whole room use --room-id parameter:

	ogcli set server --id 2 --room-id 1

To remove any existing address (which is not currently set as the
ogServer addres for any client) using the server id:

	ogcli delete server --id 2

To determine a client's associated server just list the client's
information (this requires an updated ogServer):

	ogcli list client --client-ip 10.141.10.100

	{
	  "boot": "oglive",
	  "center": 1,
	  ...
	  "server_id": 1
	}

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