Linux: update-alternatives is only usable by non-Debian distros

[ianks]

Currently, update-alternatives is used as a mechanism to detect browsers. This method only really works on Debian based distros. We should explore "alternative" mechanisms for browser detection. karma-chrome-launcher's mechanism has worked fairly well, so we should potentially do something similar.

[inikulin]

@ianks Thank you for the information! \cc @AndreyBelym Can you take a look, please?

[AndreyBelym]

karma uses which command to detect browser binaries on linux, It's very simple and should work well, if binary is in path (what is very likely). Another way is to search in MIME database for x-scheme-handler/http handlers, but it's harder a lot. I think we can implement the first option easily.

[ianks]

karma uses which command to detect browser binaries on linux, It's very simple and should work well

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