* Avoids multiple warnings when PYTHONHTTPSVERIFY=0
* Uses certs from REQUESTS_CA_BUNDLE or CURL_CA_BUNDLE when defined
just like default requests default behaviour. Previous code was
failing to use them due to wrong value being used for verify param.
* Uses workaround for requests bug that ignores verify=False when
bundle environment variables are present.
Change-Id: I329fb08547392bd305066f5a65e7d9db57da3880
Signed-off-by: Sorin Sbarnea <ssbarnea@redhat.com>