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#### Pre-Submission Checklist
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in `doc/` subfolder, the README file is autogenerated)

#### Type Of Change
- [ ] Small bug fix (non-breaking change which fixes an issue)
- [X] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
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checkboxes that apply -->
- [ ] PR should be backported to stable branches
- [ ] Tested changes locally
- [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description
<!-- Describe your changes in detail -->
Some improvements related to DMQ node status:
1. Allow other modules that use DMQ to detect NOT_ACTIVE nodes via default 
response callback. Note that only internal dmq ping mechanism can set them back 
to DMQ_NODE_ACTIVE status.
2. Simplify node status and merge DMQ_NODE_PENDING + DMQ_NODE_TIMEOUT into 
DMQ_NODE_NOT_ACTIVE since those specific states were never used to be compared 
against.
3. Add new mod parameters which will control after how many fails the node 
should be moved to DMQ_NODE_NOT_ACTIVE state.

Under testing currently. Will update if any bugs found.
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/4182

-- Commit Summary --

  * dmq: add default response callback
  * dmq: simplify node status
  * dmq: add two new modparams

-- File Changes --

    M src/modules/dialog/dlg_dmq.c (16)
    M src/modules/dialog/dlg_dmq.h (3)
    M src/modules/dmq/dmq.c (4)
    M src/modules/dmq/dmq.h (2)
    M src/modules/dmq/dmq_funcs.c (6)
    M src/modules/dmq/dmqnode.c (70)
    M src/modules/dmq/dmqnode.h (9)
    M src/modules/dmq/doc/dmq_admin.xml (64)
    M src/modules/dmq/notification_peer.c (80)
    M src/modules/dmq/notification_peer.h (3)
    M src/modules/dmq_usrloc/usrloc_sync.c (12)
    M src/modules/dmq_usrloc/usrloc_sync.h (2)
    M src/modules/htable/ht_dmq.c (15)
    M src/modules/htable/ht_dmq.h (3)
    M src/modules/presence/presence_dmq.c (16)
    M src/modules/presence/presence_dmq.h (3)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/4182.patch
https://github.com/kamailio/kamailio/pull/4182.diff

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