template_setup_posix: Suppress Yocto nativesdk installer messages

The Linux host tools for Zephyr SDK are packaged using the Yocto
nativesdk recipe and its installer may print out the messages that can
be potentially misleading to the Zephyr SDK users, who do not need to
understand the internals of the Zephyr SDK host tools integration.

This commit updates the setup script to suppress any console outputs
from the Yocto nativesdk installer script.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>

Author: stephanosio

scripts/template_setup_posix

@@ -236,7 +236,7 @@ if [ "${do_hosttools}" = "y" ]; then
   echo "Installing host tools ..."
   case ${host} in
     linux-*)
-      ./zephyr-sdk-${HOSTTYPE}-hosttools-standalone-0.9.sh -y -d .
+      ./zephyr-sdk-${HOSTTYPE}-hosttools-standalone-0.9.sh -y -d . &> /dev/null
       assert_rc "ERROR: Host tools installation failed" 30
       ;;
     macos-*)