common: Explicitly test redirection in test-webserver
common: Explicitly test redirection in test-webserver

Most tests don't disable redirection explicitly, and don't expect it to
happen even though it's enabled by default. Redirection just does not
happen because most tests run from a localhost IP, but this isn't
obvious when looking at the test.

Introduce a TestFixture flag for it and explicitly set redirection for
each test case.

martinpitt/cockpit,garrett/cockpit,moraleslazaro/cockpit,deryni/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,cockpituous/cockpit,deryni/cockpit,mvollmer/cockpit,deryni/cockpit,garrett/cockpit,cockpituous/cockpit,mvollmer/cockpit,cockpituous/cockpit,cockpit-project/cockpit,garrett/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,garrett/cockpit,martinpitt/cockpit,deryni/cockpit,martinpitt/cockpit,cockpituous/cockpit,garrett/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,deryni/cockpit,cockpit-project/cockpit,deryni/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,deryni/cockpit,cockpit-project/cockpit,cockpituous/cockpit,cockpituous/cockpit