rewrite all tests using assert

[dpastoor]

https://godoc.org/github.com/stretchr/testify/assert

[dpastoor]

• [ ] don't use reflection https://github.com/metrumresearchgroup/rcmdparser/blob/master/rcmdparser/ReadCheckDir_test.go
• [ ] clean up the gettingchecklog to simplify - https://github.com/metrumresearchgroup/rcmdparser/blob/master/rcmdparser/ParseLogsFromTestFiles_test.go
• [ ] standardize to assert - https://github.com/metrumresearchgroup/rcmdparser/blob/master/rcmdparser/parse_test.go