Fix "suggest_container_name" for Anaconda
Fix "suggest_container_name" for Anaconda

We removed the "_get_container_name_template" method in
https://github.com/storaged-project/blivet/pull/911 but Anaconda
has its own version of it so we need to keep it in our code so
Anaconda can override it with their specific version in
InstallerStorage.

rvykydal/blivet,rvykydal/blivet,vojtechtrefny/blivet,jkonecny12/blivet,vojtechtrefny/blivet,jkonecny12/blivet