Remove AutoTerminateUEeNB() functions, use auto_exec to make CI always undeploy

ci-scripts/xml_files/container_lte_n3xx_tdd_2x2_tm1.xml

@@ -40,6 +40,7 @@
 070001
 010010
 030201
+333333
 
 </TestCaseRequestedList>
   <TestCaseExclusionList></TestCaseExclusionList>
@@ -130,12 +131,14 @@
 
   <testCase id="010010">
     <class>Detach_UE</class>
+    <always_exec>true</always_exec>
     <desc>Detach UE</desc>
     <id>up2</id>
   </testCase>
 
   <testCase id="030201">
     <class>Undeploy_Object</class>
+    <always_exec>true</always_exec>
     <desc>Undeploy gNB</desc>
     <yaml_path>ci-scripts/yaml_files/lte_n3xx_tdd_2x2_tm1</yaml_path>
     <eNB_instance>0</eNB_instance>
@@ -146,5 +149,12 @@
     -->
   </testCase>
 
+    <testCase id="333333">
+        <class>Clean_Test_Server_Images</class>
+        <always_exec>true</always_exec>
+        <desc>Clean Test Images</desc>
+        <test_svr_id>0</test_svr_id>
+    </testCase>
+
 </testCaseList>