Use MD name for array name

[robn]

For example, the name here would be ssd3d1.

# mdadm --detail /dev/md2
/dev/md2:
        Version : 1.2
  Creation Time : Sun Jul  1 02:06:15 2018
     Raid Level : raid1
     Array Size : 1051148864 (1002.45 GiB 1076.38 GB)
  Used Dev Size : 1051148864 (1002.45 GiB 1076.38 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Sun Jul  1 02:21:16 2018
          State : clean, resyncing
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

  Resync Status : 19% complete

           Name : imap3:ssd3d1  (local to host imap3)
           UUID : 74e3883a:1d02265b:d2e148d9:efa70576
         Events : 3

    Number   Major   Minor   RaidDevice State
       0       8       22        0      active sync   /dev/sdb6
       1       8       38        1      active sync   /dev/sdc6