[sr-dev] [kamailio/kamailio] core: use third array element when generating totag suffix (#2696)

[Charles Chance]

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#### Description
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Since totag suffix generation was updated in 5.3 to increase randomness, the third element of the array in both parts - via1 branch and call-id - have never been included. The result is that for any given host/port the generated totag is always the same, causing issues with some UAs - specifically relating to presence subscriptions in the cases identified.
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2696

-- Commit Summary --

  * core: use third array element when generating totag suffix

-- File Changes --

    M src/core/tags.h (5)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2696.patch
https://github.com/kamailio/kamailio/pull/2696.diff

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