Prevent the SimpleSAML_Logger class from creating loops while trying to get the track ID from the session. It must now be set manually by calling SimpleSAML_Logger::setTrackID(). Also allow SimpleSAML_Memcache to differentiate between a key not found in memcache and a request to memcache failed. If all servers are down, an exception is thrown and the user informed about the internal error. This hopefully resolves #264.

Schedule SimpleSAML_Utilities::transposeArray() for removal.

Fixes a bug in Memcache.php that would cause every fetch to also
result in a push if multiple memcache servers were being used.

If multiple memcache servers are in use, the code needs to check
if they aren't out of sync. If they are, the most recent data needs
to be pushed to all mirrors.

The original code compared the parsed data structures using ===,
but that always fails because that just does a pointer comparison
and not a deep comparison.

Changed the code to compare the original unparsed values instead.
Also added a few debug-level log statements.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3359 44740490-163a-0410-bde0-09ae8108e29a

This reverts commit 3d3b437a0fe8ab7f7532015041800e2e8951cab3.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3357 44740490-163a-0410-bde0-09ae8108e29a

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3356 44740490-163a-0410-bde0-09ae8108e29a

The old test was faulty, since PHP would fail before reaching it. This
patch adds a specific test for the Memcache class before continuing.

Thanks to Thijs Kinkhorst for reporting this bug!

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