efi_loader, pytest: set up secure boot environment

A fixture for UEFI secure boot tests (image authentication and variable
authentication) is defined. A small file system with test data in a single
partition formatted in fat is created.

This test requires efitools v1.5.2 or later. If the system's efitools
is older, you have to build it on your own and define EFITOOLS_PATH.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
diff --git a/test/py/README.md b/test/py/README.md
index 2e50252..fddc104 100644
--- a/test/py/README.md
+++ b/test/py/README.md
@@ -37,7 +37,15 @@
 | openssl        |
 | sudo OR guestmount |
 | e2fsprogs      |
+| util-linux     |
+| coreutils      |
 | dosfstools     |
+| efitools       |
+| mount          |
+| mtools         |
+| sbsigntool     |
+| udisks2        |
+
 
 Please use the apporirate commands for your distribution to match these tools
 up with the package that provides them.