Changed default state_change_timeout in obmc_boot_test.robot.

This is in reponse to an error seen that would have been
resolved with this fix in place.

Change-Id: I58e9f9d2557189d488c1b900bd83b9ae713151fd
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
diff --git a/extended/obmc_boot_test.robot b/extended/obmc_boot_test.robot
index 74fc454..595ba6a 100644
--- a/extended/obmc_boot_test.robot
+++ b/extended/obmc_boot_test.robot
@@ -45,7 +45,7 @@
 ${boot_fail}                ${0}
 ${ffdc_dir_path_style}      ${EMPTY}
 ${ffdc_check}               ${EMPTY}
-${state_change_timeout}     1 min
+${state_change_timeout}     3 mins
 ${power_on_timeout}         14 mins
 ${power_off_timeout}        2 mins
 ${test_mode}                0