[libcloud] Rackspace & Linode drivers insert different node 'id' types in list_images() return value

[sstein...@gmail.com]

Hi,
        I'm working on getting default image/sizes for Rackspace and Linode.

        I'm using the list_images() call to each driver.

        Turns out that the type of the 'id' field is different (<str> for 
rackspace, <int> for linode).

        Is this intentional, or a bug?

        Seems pretty bug-like to me...but I'm not which is the "correct" type, 
nor have I tested this out on other providers.

Thanks,

S