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The following PR corrected the documentation of units according to the DIN norm in OSI. To complete the correction a test needs to be added which would have failed when the correction was not made.

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This PR adds a test for checking:

• Units defintion must be on a separate line (I made a correction in the osi_sensorviewconfiguration.proto file.)
• The syntax must be: '// Unit: m'
• First letter of Unit must always be uppercase
• Units must not be enclosed with any brackets

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@jdsika @PhRosenberger pls review and let me know your thoughts and improvements.

Check the checklist

• My code and comments follow the style guidelines and contributors guidelines of this project.
• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests / travis ci pass locally with my changes.