Fix keypair GET response schema

Nova return all the attributes as required in
GET kaypair response But response schema assume
some of the attributes are optional.

Ref- I9d8d20b42c7d32e11af479e79c9c9e8475421302
This patch fix the response schema to make strict validation.
Closes-Bug: #1670563

Change-Id: I144ee6cdecb94bed3a53efc2ea5261174b71ed43
1 file changed