Add extra test cases for growfs

Merge of master-melb:xfs-cmds:29854a by kenmcd.

  Modify the loop back grow function to include a flag for checking the fs after growin and added few more growfs test cases that are less 16TB

common.filter

@@ -153,5 +153,19 @@ _filter_mkfs()
     }'
 }
 
+
+# prints the bits we care about in growfs
+# 
+_filter_growfs()
+{
+    perl -ne '
+    if (/^data\s+=\s+bsize=(\d+)\s+blocks=(\d+), imaxpct=(\d+)/) {
+        print "xfs_growfs --BlockSize=$1 --Blocks=$2\n";
+    }
+    elsif (/^data/) {
+        print;
+    }'
+}
+
 # make sure this script returns success
 /bin/true