Add mqueue_name and mqueue_size to define queues. Updated doc.

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#### Description <!-- Describe your changes in detail -->

Add 2 new mqueue module parameters to simplify config queue definition. You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/2825

-- Commit Summary --

* mqueue: add two new module parameters

-- File Changes --

M src/modules/mqueue/doc/mqueue_admin.xml (58) M src/modules/mqueue/mqueue_mod.c (38)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2825.patch https://github.com/kamailio/kamailio/pull/2825.diff