Merge branch 'bugfix/add_input_init_of_dut_for_openthread_ci' into 'master'

openthread CI: add input init of dut for openthread CI

See merge request espressif/esp-idf!23428

examples/openthread/ot_ci_function.py

@@ -106,14 +106,12 @@ def getDataset(dut:IdfDut) -> str:
 
 
 def reset_thread(dut:IdfDut) -> None:
-    dut.write(' ')
+    dut.expect('>')
-    dut.write('state')
+    wait(dut, 3)
-    clean_buffer(dut)
-    wait(dut, 1)
     dut.write('factoryreset')
     dut.expect('OpenThread attached to netif', timeout=20)
-    dut.write(' ')
+    dut.expect('>')
-    dut.write('state')
+    wait(dut, 3)
 
 
 # get the mleid address of the thread