Adds Cinder client mock to tests

Test cases now have a mock for the method tenant_absolute_limits
in cinder client. The absence of this mock was causing real HTTP
requests from this client.

Change-Id: I8b9c4f5affc43e2649f3ebf08580bb3d3687e09b
Closes-Bug: #1259533
Quoting attachment filename

Attachment file name was not surrounded by quotes.
If an attachment was "picture of me.png", the browser was proposing to
download a file named "picture".

Change-Id: I17a1f8ca3b7ef44171c4977bacc9045e4695e18c
Closes-bug: #1245927
Merge "Quoting attachment filename"
Merge "Adds Cinder client mock to tests"