Return BC compatibility for `@Route` parameters and default values
merged branch stloyd/bugfix/issue-7724 (PR #8393)

This PR was merged into the 2.2 branch.

Discussion
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[2.2] Return BC compatibility for `@Route` parameters and default values

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7724
| License       | MIT

Commits
-------

d400b5a Return BC compatibility for `@Route` parameters and default values
Merge branch '2.2' into 2.3

* 2.2:
  Fixing singular form for kisses, accesses and addresses.
  fixed some circular references
  [Security] fixed a leak in ExceptionListener
  [Security] fixed a leak in the ContextListener
  Ignore posix_istatty warnings
  typos
  [HttpKernel] fixed route parameters storage in the Request data collector (closes #8867)
  Return BC compatibility for `@Route` parameters and default values

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Templating/Helper/FormHelper.php
	src/Symfony/Component/Console/Application.php
Merge branch '2.3'

* 2.3:
  Fixing singular form for kisses, accesses and addresses.
  fixed some circular references
  [Security] fixed a leak in ExceptionListener
  [Security] fixed a leak in the ContextListener
  Ignore posix_istatty warnings
  removed unused variable
  [Form] fix iterator typehint
  typos
  Button missing getErrorsAsString() fixes #8084 Debug: Not calling undefined method anymore. If the form contained a submit button the call would fail and the debug of the form wasn't possible. Now it will work in all cases. This fixes #8084
  Use isset() instead of array_key_exists() in DIC
  Fixed annotation
  [BrowserKit] fixed method/files/content when redirecting a request
  [BrowserKit] removed some headers when redirecting a request
  [BrowserKit] fixed headers when redirecting if history is set to false (refs #8697)
  [HttpKernel] fixed route parameters storage in the Request data collector (closes #8867)
  [BrowserKit] Pass headers when `followRedirect()` is called
  Return BC compatibility for `@Route` parameters and default values

Conflicts:
	src/Symfony/Component/Security/Http/Firewall/ContextListener.php