[sr-dev] [kamailio/kamailio] xhttp_prom: added prom_counter_dec function (#2858)

[sergey-safarov]

#### Pre-Submission Checklist
- [x] Commit message has the format required by CONTRIBUTING guide
- [x] Commits are split per component (core, individual modules, libs, utils, ...)
- [ ] Each component has a single commit (if not, squash them into one commit)
- [ ] No commits to README files for modules (changes must be done to docbook files
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:
<!-- Go over all points below, and after creating the PR, tick the checkboxes that apply -->
- [ ] PR should be backported to stable branches
- [x] Tested changes locally
- [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description
I use dialog module and want to export current active calls with custom labels.
I need to decrement the counter value when a call is terminated.
`prom_counter_dec` add this functionality.

You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2858

-- Commit Summary --

  * xhttp_prom: introduced prom_counter_update
  * xhttp_prom: replaced prom_counter_inc by prom_counter_update
  * xhttp_prom: added prom_counter_dec function
  * xhttp_prom: added rpc_prom_counter_dec
  * xhttp_prom: counter_dec published via KEMI interface
  * xhttp_prom: docbook - fixed 'Document root element "chapter", must match DOCTYPE root "book".'
  * xhttp_prom: docubook ulink elementdo not alloed inside listitem element
  * xhttp_prom: docbook para element not allowed inside another para element
  * xhttp_prom: docbook files space formating
  * xhttp_prom: added prom_counter_dec docbook description

-- File Changes --

    M src/modules/xhttp_prom/doc/xhttp_prom_admin.xml (1151)
    M src/modules/xhttp_prom/prom_metric.c (29)
    M src/modules/xhttp_prom/prom_metric.h (4)
    M src/modules/xhttp_prom/xhttp_prom.c (324)
    M src/modules/xhttp_prom/xhttp_prom.h (9)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2858.patch
https://github.com/kamailio/kamailio/pull/2858.diff

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