A typerr in the change password script caused lost of root password in test image.

src/scripts/mod_for_test_scripts/300changePassword

Index: src/scripts/mod_for_test_scripts/300changePassword
diff --git a/src/scripts/mod_for_test_scripts/300changePassword b/src/scripts/mod_for_test_scripts/300changePassword
index 5e5b6d080db4f523e006edf61a20a2a8d8596615..34a50dfe2ec0fbd9879b21dcc61e5a3ac9b7da97 100755
--- a/src/scripts/mod_for_test_scripts/300changePassword
+++ b/src/scripts/mod_for_test_scripts/300changePassword
@@ -8,7 +8,7 @@
 TEMP_SHADOWFILE=${ROOT_FS_DIR}/etc/newshadow
 CRYPTED_PASSWD="$(echo "test0000" | openssl passwd -1 -stdin)"
 echo "root:${CRYPTED_PASSWD}:14500:0:::::" > ${TEMP_SHADOWFILE}
-echo "chronos:${CRYPTED_PASSWD}:14500:0:99999::::" > ${TEMP_SHADOWFILE}
+echo "chronos:${CRYPTED_PASSWD}:14500:0:99999::::" >> ${TEMP_SHADOWFILE}
 sed '/^root/ d;/^chronos/ d' ${ROOT_FS_DIR}/etc/shadow >> ${TEMP_SHADOWFILE}
 mv -f ${TEMP_SHADOWFILE} ${ROOT_FS_DIR}/etc/shadow