Change obfs3 ipv6 integration test to vanilla ipv4; add scramblesuit test.

The ipv6 bridge has been changed to a vanilla ipv4 bridge. I've also added a
new test to check for a scramblesuit bridge. Both of these surprised me
because they had a different number of fields in each bridge line, but I've
adjusted the tests accordingly.
Whitespace fixes for bridgedb.test.test_https.
Merge branch 'fix/9874-https' into fix/9874-email
Whitespace fixes for bridgedb.test.test_smtp.
PEP8 style fixes for bridgedb.test.test_smtp.