Fix mdstat tabs parsing

collector/fixtures/proc/mdstat

@@ -16,9 +16,9 @@ md6 : active raid1 sdb2[2] sda2[0]
       [=>...................]  recovery =  8.5% (16775552/195310144) finish=17.0min speed=259783K/sec
 
 md8 : active raid1 sdb1[1] sda1[0]
-      195310144 blocks [2/2] [UU]
+	  195310144 blocks [2/2] [UU]
-      [=>...................]  resync =  8.5% (16775552/195310144) finish=17.0min speed=259783K/sec
+	  [=>...................]  resync =  8.5% (16775552/195310144) finish=17.0min speed=259783K/sec
-
+	  
 md7 : active raid6 sdb1[0] sde1[3] sdd1[2] sdc1[1]
       7813735424 blocks super 1.2 level 6, 512k chunk, algorithm 2 [4/3] [U_UU]
       bitmap: 0/30 pages [0KB], 65536KB chunk

collector/mdadm_linux.go

@@ -142,7 +142,7 @@ func parseMdstat(mdStatusFilePath string) ([]mdStatus, error) {
 			continue
 		}
 
-		if l[0] == ' ' {
+		if l[0] == ' ' || l[0] == '\t' {
 			// Those lines are not the beginning of a md-section.
 			continue
 		}