[BrowserKit] fixed headers when redirecting if history is set to false (refs #8697)
[BrowserKit] removed some headers when redirecting a request
[BrowserKit] fixed method/files/content when redirecting a request
merged branch fabpot/browserkit-redirect-22 (PR #8895)

This PR was merged into the 2.2 branch.

Discussion
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[BrowserKit] fixed the redirect behavior according to the RFC

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Commits
-------

2d34e78 [BrowserKit] fixed method/files/content when redirecting a request
64e1655 [BrowserKit] removed some headers when redirecting a request
96a4b00 [BrowserKit] fixed headers when redirecting if history is set to false (refs #8697)