Description of problem:
Tiering related information is not displayed in gluster volume status xml output. It would be good if the information is displayed in xml output for the automation purpose.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Create a volume.
2. Attach tier bricks.
3. Execute "gluster volume status --xml"

Actual results:
Tiering related information is not displayed in gluster volume status xml output

Expected results:
Tiering related information should be displayed in gluster volume status xml output

Additional info:
[root@node31 ~]# gluster volume status
Status of volume: testvol
Gluster process                             TCP Port  RDMA Port  Online  Pid
------------------------------------------------------------------------------
Hot Bricks:
Brick 10.70.46.51:/bricks/brick0/testvol_ti
er1                                         49159     0          Y       6272 
Brick 10.70.47.76:/bricks/brick1/testvol_ti
er0                                         49168     0          Y       20069
Cold Bricks:
Brick 10.70.47.76:/bricks/brick0/testvol_br
ick0                                        49167     0          Y       19975
NFS Server on localhost                     2049      0          Y       20090
NFS Server on 10.70.46.51                   2049      0          Y       6293 
 
Task Status of Volume testvol
------------------------------------------------------------------------------
Task                 : Rebalance           
ID                   : bc9c2ca3-0d8e-4096-8fbb-25c61323218b
Status               : in progress         
 
[root@node31 ~]# gluster volume status --xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cliOutput>
  <opRet>0</opRet>
  <opErrno>0</opErrno>
  <opErrstr>(null)</opErrstr>
  <volStatus>
    <volumes>
      <volume>
        <volName>testvol</volName>
        <nodeCount>5</nodeCount>
        <node>
          <hostname>10.70.46.51</hostname>
          <path>/bricks/brick0/testvol_tier1</path>
          <peerid>9d77138d-ce50-4fdd-9dad-6c4efbd391e7</peerid>
          <status>1</status>
          <port>49159</port>
          <ports>
            <tcp>49159</tcp>
            <rdma>N/A</rdma>
          </ports>
          <pid>6272</pid>
        </node>
        <node>
          <hostname>10.70.47.76</hostname>
          <path>/bricks/brick1/testvol_tier0</path>
          <peerid>261b213b-a9f6-4fb6-8313-11e7eba47258</peerid>
          <status>1</status>
          <port>49168</port>
          <ports>
            <tcp>49168</tcp>
            <rdma>N/A</rdma>
          </ports>
          <pid>20069</pid>
        </node>
        <node>
          <hostname>10.70.47.76</hostname>
          <path>/bricks/brick0/testvol_brick0</path>
          <peerid>261b213b-a9f6-4fb6-8313-11e7eba47258</peerid>
          <status>1</status>
          <port>49167</port>
          <ports>
            <tcp>49167</tcp>
            <rdma>N/A</rdma>
          </ports>
          <pid>19975</pid>
        </node>
        <node>
          <hostname>NFS Server</hostname>
          <path>localhost</path>
          <peerid>261b213b-a9f6-4fb6-8313-11e7eba47258</peerid>
          <status>1</status>
          <port>2049</port>
          <ports>
            <tcp>2049</tcp>
            <rdma>N/A</rdma>
          </ports>
          <pid>20090</pid>
        </node>
        <node>
          <hostname>NFS Server</hostname>
          <path>10.70.46.51</path>
          <peerid>9d77138d-ce50-4fdd-9dad-6c4efbd391e7</peerid>
          <status>1</status>
          <port>2049</port>
          <ports>
            <tcp>2049</tcp>
            <rdma>N/A</rdma>
          </ports>
          <pid>6293</pid>
        </node>
        <tasks>
          <task>
            <type>Rebalance</type>
            <id>bc9c2ca3-0d8e-4096-8fbb-25c61323218b</id>
            <status>1</status>
            <statusStr>in progress</statusStr>
          </task>
        </tasks>
      </volume>
    </volumes>
  </volStatus>
</cliOutput>
[root@node31 ~]#