Fix _unalignedMaxPartSize for logical partitions (#1250890)
Fix _unalignedMaxPartSize for logical partitions (#1250890)

This fixes two problems: free space inside extended partition was
not recognized and free space outside of extended partition was
considered as valid for resizing.

Signed-off-by: Vojtech Trefny <8458c114f32d8e8ef9ef32f5272e3e38bf09ddd1@redhat.com>

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