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