manchandavishal 1ac40ea95f Add exception message when user modify password same as previous
When user change password same as previous password,then user get
an error message "Unable to change password" on Horizon which
does not specify the clear reason why it cannot be change.
This patch corrects the exception raised.

Change-Id: I95acf5c579fd213d64f111010c31fe6c5a0991af
Closes-Bug: #1820102
2019-06-20 13:40:37 +00:00
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