fix handling of DRIVERS_TOOLS_BINARIES

Author: blink1073

.evergreen/install-dependencies.sh

@@ -4,7 +4,7 @@ set -eu
 # Set where binaries are expected to be.
 # On Evergreen jobs, "CI" will be set, and we don't want to write to $HOME.
 if [ "${CI:-}" == "true" ]; then
-  _BIN_DIR=$DRIVERS_TOOLS_BINARIES
+  _BIN_DIR=${DRIVERS_TOOLS_BINARIES:-}
 # On Windows spawn hosts, $HOME/cli_bin is on the PATH.
 elif [ "Windows_NT" = "${OS:-}" ]; then
   _BIN_DIR=$HOME/cli_bin

.evergreen/scripts/prepare-resources.sh

@@ -24,5 +24,5 @@ else
 fi
 
 # Add 'server' and 'hostname_not_in_cert' as a hostnames
-# echo "127.0.0.1 server" | $SUDO tee -a /etc/hosts
-# echo "127.0.0.1 hostname_not_in_cert" | $SUDO tee -a /etc/hosts
+echo "127.0.0.1 server" | $SUDO tee -a /etc/hosts
+echo "127.0.0.1 hostname_not_in_cert" | $SUDO tee -a /etc/hosts