Restore the conditional verbosity in bash scripts

Became unconditional in 422bafd6ea

Change-Id: I6e9b32d1ca4651daea26330c96c63d40e63cec00

scripts/env-setup.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-set -euxo pipefail
+set -euo pipefail
 
 . $(dirname $0)/install-deps.sh
 # NOTE(pas-ha) the above exports some useful variables like

scripts/install-deps.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-set -euxo pipefail
+set -euo pipefail
 
 if [[ "${BIFROST_TRACE:-}" == true ]]; then
     set -x