Update tarball path update on BMC

The new BMC file system /home/ is a read-only access. Changing the
tarball path to /tmp/.

Resolves  openbmc/openbmc-test-automation#941

Change-Id: Id701ba6ab2ab40e3c1242282da2d0b986ed1b764
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/utils.robot b/lib/utils.robot
index d5e7422..1e033c1 100755
--- a/lib/utils.robot
+++ b/lib/utils.robot
@@ -1019,7 +1019,7 @@
 Install Debug Tarball On BMC
     [Documentation]  Copy the debug tar file to BMC and install.
     [Arguments]  ${tarball_file_path}=${EXECDIR}/obmc-phosphor-debug-tarball-witherspoon.tar.xz
-    ...          ${targ_tarball_dir_path}=/home/root/tarball/
+    ...          ${targ_tarball_dir_path}=/tmp/tarball/
 
     # Description of arguments:
     # tarball_file_path      Path of the debug tarball file.