Check that we have big enough free space for the partition request
Check that we have big enough free space for the partition request

Related: rhbz#978266

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