[sr-dev] [kamailio/kamailio] lost: new features and http_client fix (#2606)

[Wolfgang Kampichler]

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#### Type Of Change
- [x] 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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- [x] PR should be backported to stable branches
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- [x] Related to issue #2574

#### Description
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##### http_client: http_client_request shall include default clientcert, clientkey,...
The lost module uses http_client API functions and in the course of NG112 client certificates are used for authentication when querying LIS or ECRF, the fix allows these to be read out via http_client module parameters.

##### lost: new features LoST redirect and NAPTR lookup (LIS, LoST)
The extension of the module allows dynamic querying of LIS/HELD and LOST services via NAPTR lookup. In the case of LOST, a redirect response is evaluated. In case a lost_held_request (used to connect to a LIS) is passed with an empty string ("") for the connection parameter, then P-A-I or From header value hostnames are used for NAPTR lookup to get a corresponding service. 

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

  https://github.com/kamailio/kamailio/pull/2606

-- Commit Summary --

  * initial commit

-- File Changes --

    M src/modules/http_client/functions.c (12)
    M src/modules/lost/functions.c (575)
    M src/modules/lost/lost.c (5)
    A src/modules/lost/naptr.c (254)
    A src/modules/lost/naptr.h (38)
    M src/modules/lost/pidf.c (5)
    A src/modules/lost/response.c (946)
    A src/modules/lost/response.h (131)
    M src/modules/lost/utilities.c (229)
    M src/modules/lost/utilities.h (5)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2606.patch
https://github.com/kamailio/kamailio/pull/2606.diff

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