[Bugs] [Bug 1388062] New: throw warning to show that older tier commands are depricated and will be removed.

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1388062

            Bug ID: 1388062
           Summary: throw warning to show that older tier commands are
                    depricated and will be removed.
           Product: GlusterFS
           Version: mainline
         Component: tiering
          Severity: low
          Assignee: bugs at gluster.org
          Reporter: hgowtham at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org



Description of problem:
The older tier commands are needed to be removed to aid maintaining the code.
before removing we need to a warning that these commands are depricated, use
the new ones.

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


How reproducible:
100%

Steps to Reproduce:
1.create any volume.
2.try attach brick using the old tier command "gluster v attach-tier <volname>
<brick>..
3.same thing happens for detach tier related older conmands.

Actual results:
it works

Expected results:
should throw a warning and then continue.

Additional info:
future features might not work for this command.

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