Matt Riedemann 6b04a764cb Fix 500 error when 'mountpoint' is not provided to os-attach
This fixes the 500 resulting from the KeyError when mountpoint
is not provided during an os-attach call. It also fixes the
API reference docs to no longer lie about mountpoint being
an optional parameter.

Change-Id: Ica9ccb0246bc84c087afc338b5102ce48f57e82b
Closes-Bug: #1575675
2017-03-23 12:49:30 -04:00
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