pua must not send multiple PUBLISH with the same id before receiving a reply as the ETag must be updated on subsequent publishes.
Patch by Anca Vamanu. Stolen from opensips r5924. Original commit message:
introduced a locking mechanism to prevent sending a new Publish before the reply for a previous one is received (thanks to Piotr Sobolewski <sobolewski at gmail dot com> for help with debugging)
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