Removing the bool success makes later refactorings easier to do. The
code flow is the same, except that the block handling failedProjects
after load was always run, even if SessionFile::load returned false.
The only place SessionFile::load returns false failedProjects didn't yet
change, so the code was wrong before.

Change-Id: I8ce565791d67ece7ab8fc7c4a799ed365153e34b
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>