super processing: use logical flag to denote super status

To support all partitions that are on the super partition
we now parse for the logical flag in fstab to denote super

- Remove guards for the first character being '/'.
- Skip commented lines in fstab
- Build Backup_Display_Name from partitions in super.
The first four lines that are in fstab will be
Change-Id: I3f8980187bd4a136257dd6eeaeddd7ea71706cd3

Change-Id: I1ee7c02f91aafb646beaf401a43bcb22fa8c8c7a
4 files changed