Update robot new syntax for accessing dictionary

Example:
    Accessing variable items using '&{data}[MemberId]' syntax is deprecated.
    Use '${data}[MemberId]' instead.

Change-Id: I8b495d423d62abd9577e373b16af36da41fc5950
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/ipmi/test_ipmi_sensor.robot b/ipmi/test_ipmi_sensor.robot
index 3e537cf..941d643 100644
--- a/ipmi/test_ipmi_sensor.robot
+++ b/ipmi/test_ipmi_sensor.robot
@@ -294,9 +294,9 @@
 
     @{redfish_readings}=  Redfish.Get Attribute  /redfish/v1/Chassis/chassis/Thermal  Temperatures
     FOR  ${data}  IN  @{redfish_readings}
-        ${redfish_value}=  Set Variable If  '&{data}[MemberId]' == '${member_id}'
+        ${redfish_value}=  Set Variable If  '${data}[MemberId]' == '${member_id}'
         ...  &{data}[ReadingCelsius]
-        Exit For Loop If  '&{data}[MemberId]' == '${member_id}'
+        Exit For Loop If  '${data}[MemberId]' == '${member_id}'
     END
     [Return]  ${redfish_value}