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]