Use osc-lib directly for exceptions.
Leave openstackclient.common.exceptions for deprecation period.
Change-Id: Iea3e862302372e1b31ccd27f69db59b4953ca828
The --enable option on commands is ignored when the arguments are parsed.
This is related to the --enable-beta-commands option. Renaming the option
to --os-beta-command fixes the problem.
There's no need to handle backwards compatibility for the option name
change because there hasn't been an OSC release yet with beta commands.
Change-Id: I0327ba8a2058858a83e9a42e231470ed733cc834
Closes-Bug: #1588384
