Fix crash close_orphaned_sr_transactions() BF abort

Some implementations of provider `bf_abort()` require `victim_ctx`
to point to application side victim context. However, when
total order BF abort was done from `close_orphaned_sr_transactions()`,
the application side context was not available.

To fix this, added an interface method `call_in_operation_context()`
which allows invoking a function object with a reference to
application side operation context passed in as a parameter.
This method is used in `close_orphaned_sr_transactions()`
to call `client_state::total_order_bf_abort()` with appropriate
victim operation context.

include/wsrep/client_service.hpp

@@ -28,10 +28,13 @@
 #define WSREP_CLIENT_SERVICE_HPP
 
 #include "buffer.hpp"
+#include "operation_context.hpp"
 #include "provider.hpp"
 #include "mutex.hpp"
 #include "lock.hpp"
 
+#include <functional>
+
 namespace wsrep
 {
     class client_service
@@ -212,6 +215,15 @@ namespace wsrep
          */
         virtual bool is_xa_rollback() = 0;
 
+        /**
+         * Perform a function call in operation context associated
+         * with the client service. The implementation must call @p fn
+         * with operation_context set appropriately.
+         */
+        virtual void call_in_operation_context(
+            const std::function<void(wsrep::operation_context&)>& fn) const
+            = 0;
+
         //
         // Debug interface
         //