Add CI tests using the Standard Test Interface
    
    Adding initial set of basic functionality tests for NetworkManager
    according to the Standard Test Interface [1]. See Quick Start Guide
    for brief introduction about how to run these tests [2].
    
    [1] https://fedoraproject.org/wiki/CI/Standard_Test_Interface
    [2] https://fedoraproject.org/wiki/CI/Quick_Start_Guide