break large function

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#### Type Of Change - [x] refactoring (non-breaking change which adds new functionality)

#### Description This large function `ds_manage_routes` is quite large and the intent of every code block is becoming hard to read and assess.

In order to avoid mixing refactoring with behavioral modifications I thought it was best to make a separate MR. You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/2499

-- Commit Summary --

* dispatcher: ds_manage_routes refactoring

-- File Changes --

M src/modules/dispatcher/dispatch.c (111)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2499.patch https://github.com/kamailio/kamailio/pull/2499.diff