Fix ESP detection
1. adjust the regular expression to meet correct ESP which partition
index greater than 10.
2. output the right failure filename in deferred_check_uefi_logs_esp()
Signed-off-by: 
Weizhao Ouyang <weizhao.ouyang@arm.com>
1. adjust the regular expression to meet correct ESP which partition
index greater than 10.
2. output the right failure filename in deferred_check_uefi_logs_esp()
Signed-off-by: Weizhao Ouyang <weizhao.ouyang@arm.com>