fix script err

fvt_scripts/edgex_sink_rule.jmx

@@ -438,7 +438,7 @@
           <JSONPathAssertion guiclass="JSONPathAssertionGui" testclass="JSONPathAssertion" testname="temperature Assertion" enabled="true">
             <stringProp name="JSON_PATH">$.readings[1].value</stringProp>
             <stringProp name="EXPECTED_VALUE">72</stringProp>
-            <boolProp name="JSONVALIDATION">true</boolProp>
+            <boolProp name="JSONVALIDATION">false</boolProp>
             <boolProp name="EXPECT_NULL">false</boolProp>
             <boolProp name="INVERT">false</boolProp>
             <boolProp name="ISREGEX">false</boolProp>