CI: start-bosh scripts have DEBUG flag

Set the env var DEBUG to any non-empty value and both bash and bosh
debug logging will be enabled.

Author: aramprice

ci/dockerfiles/docker-cpi/start-bosh.sh

@@ -1,6 +1,10 @@
 #!/usr/bin/env bash
 
 set -e
+if [[ -n "${DEBUG:-}" ]]; then
+  set -x
+  export BOSH_LOG_LEVEL=debug
+fi
 
 function generate_certs() {
   local certs_dir

ci/dockerfiles/warden-cpi/start-bosh.sh

@@ -1,6 +1,10 @@
 #!/usr/bin/env bash
 
 set -e
+if [[ -n "${DEBUG:-}" ]]; then
+  set -x
+  export BOSH_LOG_LEVEL=debug
+fi
 
 local_bosh_dir="/tmp/local-bosh/director"