Unset the http_proxy environment variable before running tests.

[panlinux]

Unset the http_proxy environment variable before running tests.

Description

Two connection tests (test_constructor and test_connection_to_unusual_port)
assume that there is no external real proxy in the test environment. Turns
out LibcloudConnection() will honor a http_proxy shell variable if it's set,
so if the test suite is run in such an environment, these tests will fail:

self = <libcloud.test.test_connection.BaseConnectionClassTestCase testMethod=test_connection_to_unusual_port>

    def test_connection_to_unusual_port(self):
        conn = LibcloudConnection(host='localhost', port=8080)
>       self.assertEqual(conn.proxy_scheme, None)
E       AssertionError: 'http' != None

libcloud/test/test_connection.py:107: AssertionError

self = <libcloud.test.test_connection.BaseConnectionClassTestCase testMethod=test_constructor>

    def test_constructor(self):
        conn = LibcloudConnection(host='localhost', port=80)
>       self.assertEqual(conn.proxy_scheme, None)
E       AssertionError: 'http' != None

libcloud/test/test_connection.py:80: AssertionError

I also added a test for this behavior (the honoring of http_proxy) to the existing test_constructor test.

Status

• done, ready for review

Checklist (tick everything that applies)

• Code linting (required, can be done after the PR checks)
• Documentation
• Tests
• ICLA (required for bigger changes)

[pquentin]

Looks good to me, thanks @panlinux! Will merge when I have a chance.

[pquentin]

Turns out I was able to do it now. Thanks @panlinux! Merged in trunk.