storage_test fails when parted dumps a warning

[Jeff Lane ]

Found this on a test system. Parted dumped a warning message that included the device name in the message, this caused the grep in storage test (that greps for $DISK in the parted output) to grab the wrong thing.

Here's the actual test output:

Warning: Unable to open /dev/sda read-write (Read-only file system). /dev/sda has been opened read-only.
Model: VIRTUAL-DISK (scsi)
Disk /dev/sda: 1476MB
Sector size (logical/physical): 512B/4096B
Partition Table: loop

Number Start End Size File system Flags
 1 0.00B 1476MB 1476MB ext4

Ignore the read-only bit, that's secondary to this bug and will also be fixed. The important thing is that because /dev/sda appears in the warning, the grep grabs that and then the awk grabs the word "to" and thus creates a $SIZE variable that looks like this:

"to 1476MB"

To fix this:
Change the regex
add some error handling