[1.2, 1.3] Fixes issue with timed out users and credentials not clearing (closes #5967)
[1.2, 1.3] Fixes issue with timed out users and credentials not clearing (closes #5967)


git-svn-id: e6180648f1438032975755a03660179a2fce9ff1@15832 ee427ae8-e902-0410-961c-c3ed070cd9f9

nixilla/sfDoctrineGuardPlugin,pixelfusion/sfDoctrineGuardPlugin,maxim-oleinik/sfDoctrineGuardPlugin