Bug 1128358

Description of problem:
Having two packages (foo, bar) doing pretty much the same thing and other package that depends on them; then when I want to switch the packages (i.e. uninstall foo package and install bar) I am not able to do that in one transaction in dnf. I can do it by first uninstalling foo in one transaction and then installing bar in the second transaction, which means dnf will remove all dependencies as well.

In yum there was `yum shell` command, that I could use to do more steps in one transaction and eventually replace foo with bar without loosing the dependencies.

I'm not saying we need `shell` command in dnf, but I'm missing the feature where I can replace a package without dependencies being touched.

If there is a way to do it with dnf, please, educate me. If not, take this as RFE. Actually implementing something like `yum shell` seems like a good way to do it.