[TestFix] Remove hot and cold bricks list on regular volumes

For the non-tiered volume types, In few test cases while bringing
bricks offline, collecting both hot_tier_bricks and cold_tier_bricks
and it is not needed to collect hot and cold tier bricks.

Removing the hot and cold tiered bricks and collecting only bricks
of the particular volume as mentioned below.

Removing below section
```
bricks_to_bring_offline_dict = (select_bricks_to_bring_offline(
                self.mnode, self.volname))
bricks_to_bring_offline = list(filter(None, (
bricks_to_bring_offline_dict['hot_tier_bricks'] +
bricks_to_bring_offline_dict['cold_tier_bricks'] +
bricks_to_bring_offline_dict['volume_bricks'])))
```

Modifying as below for bringing bricks offline.
```
bricks_to_bring_offline = bricks_to_bring_offline_dict['volume_bricks']
```

Change-Id: Icb1dc4a79cf311b686d839f2c9390371e42142f7
Signed-off-by: Bala Konda Reddy M <bala12352@gmail.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/tests/functional/snapshot/test_snap_self_heal.py b/tests/functional/snapshot/test_snap_self_heal.py
index 3ee80e100..9cc6d8298 100644
--- a/tests/functional/snapshot/test_snap_self_heal.py
+++ b/tests/functional/snapshot/test_snap_self_heal.py
@@ -166,10 +166,8 @@ class SnapshotSelfheal(GlusterBaseClass):
         g.log.info("Starting to bring bricks to offline")
         bricks_to_bring_offline_dict = (select_bricks_to_bring_offline(
             self.mnode, self.volname))
-        bricks_to_bring_offline = list(filter(None, (
-            bricks_to_bring_offline_dict['hot_tier_bricks'] +
-            bricks_to_bring_offline_dict['cold_tier_bricks'] +
-            bricks_to_bring_offline_dict['volume_bricks'])))
+        bricks_to_bring_offline = bricks_to_bring_offline_dict['volume_bricks']
+
         g.log.info("Brick to bring offline: %s ", bricks_to_bring_offline)
         ret = bring_bricks_offline(self.clone, bricks_to_bring_offline)
         self.assertTrue(ret, "Failed to bring the bricks offline")