[fyi][icedtea-web] adding midori and epiphany into family of tested browsers

[Pavel Tisnovsky]

Jiri Vanek wrote:
> I have been asked by brno-desktop member if we can run testsuite also
> against gtk browsers. This patch is ensuring that they are properly
> detected and send to engine.
> Also I have extracted several repeating parts to variables.
> 
> Ok for head?
> 
Hi Jiri,

this enhancement and refactoring looks good. I think it's a better solution
to have a set of "Mozilla-like" browsers listed on one line and not spread
over a whole Makefile.am.

Thanks,
Pavel