[sr-dev] [kamailio/kamailio] acc: Allow nullable cdr extra fields (#1385)

[Carlos Cruz Luengo]

#### Pre-Submission Checklist
- [x] Commit message has the format required by CONTRIBUTING guide
- [x] Commits are split per component (core, individual modules, libs, utils, ...)
- [x] Each component has a single commit (if not, squash them into one commit)
- [x] 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:
- [x] PR should be backported to stable branches
- [x] Tested changes locally
- [x] Related to issue #1378 

#### Description

- allow custom cdr fields defined with cdr_extra modparam to be saved
  as null. Before this change, cdr_extra variables not defined in config
  operation (or set to $null) were saved as empty string (''). This commit makes
  possible to save them as NULL value.

- new modparam to make this behaviour configurable: cdr_extra_nullable.
  Set it to 1 to enable this new behaviour (default value: 0)
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/1385

-- Commit Summary --

  * acc: Allow nullable cdr extra fields

-- File Changes --

    M src/modules/acc/acc_cdr.c (11)
    M src/modules/acc/acc_mod.c (8)
    M src/modules/acc/acc_mod.h (1)
    M src/modules/acc/doc/acc_admin.xml (22)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1385.patch
https://github.com/kamailio/kamailio/pull/1385.diff

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