list images does not break in case of invalid OS image types

[mgogoulos]

Make sure that list_images will not break if one of the IMAGE_PROJECTS keys (OS image types) changes in future. Right now if you run list_images with an invalid project name, the connection.request_path is not restored after the exception is run, so all requests that follow will be invalid.

from libcloud.compute.providers import get_driver; from libcloud.compute.types import Provider; driver = get_driver('gce')

c = driver('email', 'key_path', project='name')

c.list_images(ex_project='centos-cloudX')
InvalidRequestError

c.list_nodes()
InvalidRequestError

[erjohnso]

Thanks @mgogoulos - this looks great. @Kami just cut 0.17.0, so I don't think it will get added to the release, but definitely will merge when travis catches up.

[Kami]

@erjohnso If you think this is a big issue, you can also vote -1 and we can cancel the vote and roll out a new release.

Or we can wait and release 0.17.1 soon after 0.17.0 is out.

[erjohnso]

I think it's a great fix and hardens the driver, but I don't think we need to hold off on 0.17.0. Adding it the next release is fine.

Thanks again @mgogoulos!