Fix IPMI SOL UnicodeDecodeError in test

Change-Id: Ief192ce16663f1a36ea9e1ca165662a2e9e4d0fe
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/ipmi_client.robot b/lib/ipmi_client.robot
index d485af3..0dccdbf 100755
--- a/lib/ipmi_client.robot
+++ b/lib/ipmi_client.robot
@@ -215,8 +215,7 @@
     ...  Run Keyword And Ignore Error  Terminate Process  sol_proc
     ...  AND  Return From Keyword  ${output}
 
-    ${rc}  ${output}=  Run and Return RC and Output  cat ${file_path}
-    Should Be Equal  ${rc}  ${0}  msg=${output}
+    ${output}=  OperatingSystem.Get File  ${file_path}  encoding_errors=ignore
 
     # Logging SOL output for debug purpose.
     Log  ${output}