better support storage volumes (adapted from CyanogenMod SR)
do not log failure to write fstab entry for ramdisk
properly write mtd/bml entries to /etc/fstab
always unmount /data when requested
do not show mount/unmount /sdcard on /data/media devices

applies to old recovery.fstab with /sdcard entry having fs_type = datamedia
clean up code
do not wipe /data/media on wipe_data recovery start command
standardize logging to stdout
always use if is_data_media_volume_path() to handle /data/media volume check
clean up
fix mistype: primary path and data media detection
improve using legacy lun haring on vold volumes
6.54.8