There is no need for a "safe" version of the RCU list iteration macros,
because the ordinary version of the macros is "safe". Linux 2.6.26-rc1
removed these "safe" versions, so this change modifies OpenFlow's uses
of these macros to use the ordinary versions. This also simplifies the
code because we don't need to use the list_entry macros any longer.
Ben Pfaff
Martin Casado