[sr-dev] [kamailio/kamailio] dispatcher: add destination to in-memory dispatcher list (#1782)

[Timmo Verlaan]

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#### Description
To prevent code duplication I refactored ds_log_set a bit to allow for re-use of loop over all destinations and execute a callback. Perhaps there are more places this could be useful.

Add dispatcher.add rpc call to add destinations to in-memory dispatcher list. This allows for more quick and flexible updates to dispatcher list in kamailio.

_A few ideas that build on top of this change are:_

1. modparam for reload to keep in-memory entries or not
2. modparam to not read list or db
3. `dispatcher.remove _group_ _destination_`
4. modifying in routing script with `ds_add_dst`/`ds_remove_dst`

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

  https://github.com/kamailio/kamailio/pull/1782

-- Commit Summary --

  * dispatcher: add destination to in-memory dispatcher list

-- File Changes --

    M src/modules/dispatcher/dispatch.c (81)
    M src/modules/dispatcher/dispatch.h (1)
    M src/modules/dispatcher/dispatcher.c (29)
    M src/modules/dispatcher/doc/dispatcher_admin.xml (32)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1782.patch
https://github.com/kamailio/kamailio/pull/1782.diff

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