IPMI: Modified script based on oem sensor

Changes:
   -Modified script based on oem sensor count in
    Verify_Sensor_And_SDR_Count_In_Get_Device_SDR_Info
   _Via_Inband_IPMI Testcase
   -Modified the function name as fetch_oem_sdr_count in ipmi_utils.py
   -Modified keyword name as Fetch OEM Sdr Count in ipmi_test_sdr.robot

Tested:
   -Ran scripts  Successfully

Change-Id: I6dabd17da4942258b855e01197d3de6229160b3d
Signed-off-by: manimozhik <manimozhik@ami.com>
diff --git a/lib/ipmi_utils.py b/lib/ipmi_utils.py
index a9bebd7..9e0bcc8 100644
--- a/lib/ipmi_utils.py
+++ b/lib/ipmi_utils.py
@@ -355,7 +355,7 @@
     return result
 
 
-def fetch_sdr_count(sdr_data):
+def fetch_oem_sdr_count(sdr_data):
     r"""
     Get IPMI SDR list and return the SDR OEM count.