package_config/LINARO: Install python3-{pexpect, yaml} instead of python2

Python2 is EOF and this packages was installed to be able use
test-runner and is already migrated to python3.

https://github.com/Linaro/test-definitions/commit/dc338f66b5f34c911e94f92cadafefcbe2b75a2c

Signed-off-by: Aníbal Limón <anibal.limon@linaro.org>
Change-Id: I2ebfc2b5657ee95d4d32a892539512d671b351c2
diff --git a/package_config/LINARO b/package_config/LINARO
index 53c7bd4..adbfe5f 100644
--- a/package_config/LINARO
+++ b/package_config/LINARO
@@ -1,6 +1,6 @@
 PACKAGES install-norec
 linaro-overlay-minimal
 96boards-tools-common
-python-pexpect
-python-yaml
+python3-pexpect
+python3-yaml
 rsync