Typing errors in service templates contained into examples/ and tests/integration/

[philippemerle]

Several typing errors are present in service templates contained into examples/ and tests/integration/. I already reported and corrected these errors, see the following issues:

• https://github.com/xlab-si/xopera-examples/issues/28
• https://github.com/xlab-si/xopera-examples/issues/30
• https://github.com/xlab-si/xopera-examples/issues/31
• https://github.com/xlab-si/xopera-examples/issues/33
• https://github.com/xlab-si/xopera-examples/issues/35
• https://github.com/xlab-si/xopera-examples/issues/37
• https://github.com/xlab-si/xopera-examples/issues/38
• https://github.com/xlab-si/xopera-examples/issues/40
• https://github.com/xlab-si/xopera-examples/issues/45

I propose to apply all these corrections to files of this repository.