Add dib-lint checks for elements

Also dib-lint errors fixed or skipped

Change-Id: I74a386bf7d13203df9e93b6469384648df2ac389

elements/hadoop/post-install.d/firstboot

@@ -1,4 +1,5 @@
 #!/bin/bash
+# dib-lint: disable=executable
 
 if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
     set -x

elements/mysql/install.d/start-mysql.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+# dib-lint: disable=executable
 
 if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
     set -x

elements/storm/install.d/60-storm

@@ -5,7 +5,7 @@
 if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
     set -x
 fi
-set -u
+set -eu
 set -o pipefail
 
 tmp_dir=/tmp/storm

tox.ini

@@ -23,6 +23,7 @@ commands = bash -c "find {toxinidir} -not -wholename \*.tox/\* -and \( -name \*.
 commands =
     flake8 {posargs}
     {toxinidir}/tools/run_bashate.sh
+    dib-lint
 
 [testenv:venv]
 commands = {posargs}