[HttpFoundation] use different approach for duplicate keys in postgres, fix merge for sqlsrv and oracle
[Doctrine Bridge] fix DBAL session handler according to PdoSessionHandler
bug #11009 [HttpFoundation] smaller fixes for PdoSessionHandler (Tobion)

This PR was merged into the 2.3 branch.

Discussion
----------

[HttpFoundation] smaller fixes for PdoSessionHandler

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #10652
| License       | MIT

For both the PdoSessionHandler and DbalSessionHandler
- https://github.com/symfony/symfony/pull/10652#issuecomment-42370425: Transactional DELETE + INSERT does not work as expected
- https://github.com/symfony/symfony/pull/10652#issuecomment-44359784: sqlsrv 2005 does not support the MERGE SQL, and if used it requires an HOLDLOCK
- missing time update for sqlsrv and oracle

Commits
-------

a0e1d4d [Doctrine Bridge] fix DBAL session handler according to PdoSessionHandler
00d707f [HttpFoundation] use different approach for duplicate keys in postgres, fix merge for sqlsrv and oracle