Adjust dkms match command parsing and add a test

[scaronni]

Fixes #578

[scaronni]

@aaronzguan can I get some feedback? To test:

$ git clone https://github.com/scaronni/dkms.git
$ cd dkms
$ git checkout dkms_match_parsing
$ make
$ sudo cp dkms $(which dkms)

[amilonenv]

LGTM

[aaronzguan]

@scaronni Thanks for the fix. I've tested it, it looks good