Add ``--force`` option to ``volume qos delete`` command in volume v1 and v2 to allow users to delete in-use QoS specification(s). Change-Id: I46036e5f55ced8b8a1be54c521f2a5c242b89160 Closes-Bug: #1596821
Volume is better to be replaced by Block Storage in the doc. Change-Id: I736669ee01c7385b6e701cb20f4334eff1c49286
For consistency, use dashes instead of underscores. Change-Id: I2da19b56952a8a9d172793ae211bdc58ddff4146