Fixed missing parameter when using ipmi user summary

When execute inband command ipmitool user summary
it will return 'IPMI command failed: Unknown (0x82)'
Because it missing a parameter <channel number>
User Commands:
               summary      [<channel number>]

Signed-off-by: Tony Lee <tony.lee@quantatw.com>
Change-Id: I3b37995eb6150e870495ae16de9271cc8bd0341b
diff --git a/ipmi/test_ipmi_user.robot b/ipmi/test_ipmi_user.robot
index b20abea..bbc82c2 100644
--- a/ipmi/test_ipmi_user.robot
+++ b/ipmi/test_ipmi_user.robot
@@ -43,7 +43,8 @@
 
     # Verify maximum user count IPMI local user can have. Also verify
     # currently enabled users.
-    ${resp}=  Wait Until Keyword Succeeds  15 sec  5 sec  Run IPMI Standard Command  user summary
+    ${resp}=  Wait Until Keyword Succeeds  15 sec  5 sec  Run IPMI Standard Command
+    ...  user summary ${CHANNEL_NUMBER}
     ${enabled_user_count}=
     ...  Get Lines Containing String  ${resp}  Enabled User Count
     ${maximum_ids}=  Get Lines Containing String  ${resp}  Maximum IDs