Unify shell attributes in all cartridge scripts

Turn off debugging level output:
`set +x' by default
`set -x' should be explicitely enabled for debugging purposes only

Be more strict, fail on errors:
`set -e' by default
`set +e' should be enabled explicitely for a certain sequence of
commands only

Be more strict, fail on unset variables:
`set -u' by default
`set +u' should be enabled explicitely for a certain sequence of
commands only

https://bugzilla.redhat.com/show_bug.cgi?id=1168512

[test] [extended:cartridge]