SEL Script Changes

ipmi/test_ipmi_sel_time.robot script changes
- In test_ipmi_sel_time.robot script created an time difference list and from time difference list
date and time will be either incremented or decremented.

- Removed Identify SEL Time Future DateTime and Identify SEL Time DateTime Delay and added Identify SEL Time keyword
for incrementing or decrementing date and time.

- Modified Verify Last SEL Added keyword previously sel elist last 1 command was used to get last sel entry but sometimes
while adding sel time at the same time there may be an chance other sel also can be generated. so handled the code to get
complete sel elist via ipmi sel elist command and fetch the sel entry based on sensor name and event type. keyword also
renamed to Verify SEL Added.

ipmi/test_ipmi_sel.robot
- As Get Data And Byte From SDR sensor keyword was modified based on the modification
remodified the variable for this keyword.
- Like ipmi_sel_time.robot script verify sel entry command was modified.

lib/ipmi_client.robot
- Get Data And Byte From SDR Sensor keyword return variable ${field_data} was removed.

Tested:
	- Tested ipmi/test_ipmi_sel_time.robot script.
	- Tested ipmi/test_ipmi_sel.robot script.

Signed-off-by: ganesanb <ganesanb@ami.com>
Change-Id: If0342c07c16ecc83a0cc092e6f3476eea42d63f5
diff --git a/lib/ipmi_client.robot b/lib/ipmi_client.robot
index 87dd411..136aa3d 100755
--- a/lib/ipmi_client.robot
+++ b/lib/ipmi_client.robot
@@ -545,7 +545,7 @@
     [Return]  ${setting_status}
 
 
-Get Data And Byte From SDR Sensor
+Get Bytes From SDR Sensor
     [Documentation]  Fetch the Field Data and hexadecimal values from given details.
     [Arguments]  ${sensor_detail}
 
@@ -555,12 +555,10 @@
     #                          ${sensor_detail} will be "Sensor ID : SENSOR_1 (0xHH)"
 
     ${sensor_detail}=  Split String  ${sensor_detail}  (0x
-    ${field_data}=  Set Variable  ${sensor_detail[0]}
-    ${field_data}=  Remove Whitespace  ${field_data}
     ${sensor_hex}=  Replace String  ${sensor_detail[1]}  )  ${EMPTY}
     ${sensor_hex}=  Zfill Data  ${sensor_hex}  2
 
-    [Return]  ${field_data}  ${sensor_hex}
+    [Return]  ${sensor_hex}
 
 
 Get Current Date from BMC