Add yum-plugin-replace to available yum plugins

[Lewis Rosenthal]

yum-plugin-replace provides for swapping conflicting packages, either different ones or the same, but for different arches. Thus, it is possible to:

yum replace mysql --replace-with mysql51

without uninstalling the first package and then installing the replacement. This also works for packages which are "locked" by dependencies.

Source: ​https://github.com/iuscommunity/yum-plugin-replace

Presently, the only alternative to this is to use the yum shell to uninstall and then install, and even that is not as robust as yum-plugin-replace.

[Silvan Scherrer]

it's in exp repo. have fun with it