test(robot): fix test case Test Node ID Change During Backing Image Creation failure caused by execute_command exception

Signed-off-by: Yang Chiu <yang.chiu@suse.com>
(cherry picked from commit 62fb430)

Author: yangchiu

e2e/keywords/longhorn.resource

@@ -243,7 +243,7 @@ Delete Longhorn node ${node_id}
     execute_command
     ...    kubectl taint node ${node_name} node-role.kubernetes.io/worker=true:NoExecute
     wait_for_longhorn_node_down    ${node_name}
-    execute_command_until_success
+    execute_command_and_wait_for_output
     ...    kubectl -n longhorn-system delete nodes.longhorn.io ${node_name}
     ...    node.longhorn.io "${node_name}" deleted
 

e2e/libs/keywords/common_keywords.py

@@ -71,15 +71,6 @@ def execute_command_and_expect_output(self, cmd, expected_output):
             time.sleep(retry_count)
             assert False, f"Failed to find {expected_output} in {cmd} result: {res}"
 
-    def execute_command_until_success(self, cmd, expected_output):
-        retry_count, retry_interval = get_retry_count_and_interval()
-        for _ in range(retry_count):
-            res = subprocess_exec_cmd(cmd)
-            if expected_output in res:
-                return res
-            time.sleep(retry_interval)
-        assert False, f"'{expected_output}' not found in command result: {res}"
-
     def execute_command_and_wait_for_output(self, cmd, output):
         retry_count, retry_interval = get_retry_count_and_interval()
         for i in range(retry_count):