[IMP] im_livechat: improve random assignation of conversations

Task #1919871

Purpose
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The method 'get_mail_channel' in the 'im_livechat.channel' model used a simple random.choice in
the available users to select the operator.

It was improved to select the operator that has the lowest number of active livechats. If multiple
operators share the same number (lowest) of active livechats, it selects randomly between those.

A livechat is considered 'active' if it has at least one message within the last hour.

Spec
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The assignation method should always give the new conversation to the operator who
has the less active conversation.

If two operators have the same amout of active conversation, it should chose one of
them randomly.

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