test/pr: PRout PREEMPT remove registration test

Check that the Persistent Reserve Out PREEMT request removes the
registration referenced by the service action key.

Signed-off-by: David Disseldorp <ddiss@suse.de>

test-tool/iscsi-test-cu.h

@@ -131,6 +131,7 @@ void test_prout_reserve_ownership_wero(void);
 void test_prout_reserve_ownership_eaar(void);
 void test_prout_reserve_ownership_wear(void);
 void test_prout_clear_simple(void);
+void test_prout_preempt_rm_reg(void);
 
 void test_read6_simple(void);
 void test_read6_beyond_eol(void);