Auto merge of #6163 - jdm:yumupdate, r=jdm
Auto merge of #6163 - jdm:yumupdate, r=jdm

According to the official change set [1] for Fedora 22 which will be released in some days [2] yum will be replaced by dnf. The syntax is basically the same (in these simple cases here it is exactly the same, tested with dnf). After that only Fedora 21 and 22 will be supported, both come with dnf shipped by default.

[1] https://fedoraproject.org/wiki/Releases/22/ChangeSet#Replace_Yum_With_DNF
[2] https://fedoraproject.org/wiki/Releases/22/Schedule?rd=Releases/22

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berg/servo,DominoTree/servo,youprofit/servo