[#581] close Output and Error stream threads after command is done

[kstekovi]

…command

Please make sure your PR meets the following requirements:

• Pull Request contains a description of the changes
• Pull Request does not include fixes for multiple issues/topics
• Code is formatted, imports ordered, code compiles and tests are passing
• Code is self-descriptive and/or documented

[simkam]

thanks @kstekovi!