[ZF-12465] Fix session identifier issue on Zend Server
[ZF-12465] Fix session identifier issue on Zend Server

- Pulls a segment of the identifier for validation prior when Zend Server
  cluster session save handler is detected.

git-svn-id: abaeb2b3ba5a94ed391a9405ad7d63d0414021c9@25120 44c647ce-9c0f-0410-b52a-842ac1e357ba

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