rbd: create command throws inappropriate error messages

rbd: create command throws inappropriate error messages

Fixes: #2862
Changes related to rbd file

Changes to rbd.cc
-----------------

Change 1: line# 2744 to 2747

 If the option is --order then do the check of its value if its less
 than 12 or greaterthan 25 then throw error. Correct value of --order
 is 12 to 25.

Change 2: Removal of validation from line# 3205 to 3209

  Since the check for correct value of --order is done before hence the
  check here is not needed.

Signed-off-by: Rajesh Nambiar <rajesh.n@msystechnologies.com>