Remove MGS reference in Shine.Lustre.Disk

[degremont]

Shine.Lustre.Disk did not need a reference to any target name.

The MGS check in this class should be removed, and the verification should be, in fact, done in the function calling this code.
This means, the MGT Target should be careful to not check the device fsname as it could be different from its own fsname.

Reported by: degremont

[degremont]

        type
            changed from Bug to Refactor

Original comment by: degremont

[degremont]

        milestone
            changed from 0.908 to 1.1

Original comment by: degremont

[degremont]

        status
            changed from new to closed
        
        resolution
            set to fixed
        
        milestone
            changed from 1.1 to 0.908

Fixed in SVN commit r272.

Original comment by: degremont