Remove more usages of xtrace (#630)

Author: blink1073

.evergreen/docker/ubuntu20.04/base-entrypoint.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-set -eux
+set -eu
 
 # Remove the virtual env.
 rm -rf $DRIVERS_TOOLS/.evergreen/venv || true

.evergreen/k8s/eks/setup-cluster.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -eux
+set -eu
 
 SCRIPT_DIR=$(dirname ${BASH_SOURCE[0]})
 . $SCRIPT_DIR/../../handle-paths.sh

.evergreen/k8s/eks/setup.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -eux
+set -eu
 
 SCRIPT_DIR=$(dirname ${BASH_SOURCE[0]})
 . $SCRIPT_DIR/../../handle-paths.sh

.evergreen/k8s/eks/teardown.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -eux
+set -eu
 
 SCRIPT_DIR=$(dirname ${BASH_SOURCE[0]})
 . $SCRIPT_DIR/../../handle-paths.sh