Use container's parent's name for PV if available (#1065737)
Use container's parent's name for PV if available (#1065737)

When modifying the PV in the LVMFactory, we want to keep its name.

vojtechtrefny/blivet,AdamWill/blivet,dwlehman/blivet,vpodzime/blivet,jkonecny12/blivet,rvykydal/blivet,jkonecny12/blivet,vojtechtrefny/blivet,rvykydal/blivet,AdamWill/blivet,vpodzime/blivet,rhinstaller/blivet,rhinstaller/blivet,dwlehman/blivet