Currently, on systems like Fedora and Debian, it is possible to import
urllib3 as well as requests.packages.urllib3. They functionally point to
the same code but sys.modules considers them to be separate items. When
downstream packagers unvendor urllib3 from requests, they also change
all the imports inside of the package. So if the code imports urllib3
from requests.packages.urllib3 and modifies globals in a submodule, that
will not be visible to requests since it has been rewritten to use
urllib3 (not requests.packages.urllib3). By handling this logic
ourselves, we can issue a release until upstream packages and requests
can fix this and cut a new release.
Change-Id: Ic77ce8a06d9d148a899b4b8695990fca8fdaefc5
Closes-bug: 1396550
Ian Cordasco
7ee96cbe39