feature #10483 [Admin]Admin choose channel in product show page (Tomanhez)
feature #10483 [Admin]Admin choose channel in product show page (Tomanhez)

This PR was merged into the 1.6-dev branch.

Discussion
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| Q               | A
| --------------- | -----
| Branch?         | master
| Bug fix?        | yes
| New feature?    | no
| BC breaks?      | no
| Deprecations?   | no
| License         | MIT

**Before clicking:**
![Screenshot 2019-07-01 at 10 29 19](https://user-images.githubusercontent.com/39232096/60425503-f23d3800-9bf2-11e9-9b25-a4aecda4fd24.png)

**After clicking in several channels:**
![Screenshot 2019-07-01 at 10 29 51](https://user-images.githubusercontent.com/39232096/60425551-0bde7f80-9bf3-11e9-9630-7ad5674ab05d.png)

**One Channel**
![Screenshot 2019-07-03 at 13 42 41](https://user-images.githubusercontent.com/39232096/60591990-ea6ec680-9d9f-11e9-82a4-c9131f568a5e.png)

**All channels are disabled in product**
![Screenshot 2019-07-04 at 10 01 31](https://user-images.githubusercontent.com/39232096/60649911-50605a00-9e43-11e9-938c-4d7c25af3695.png)


Commits
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037e971ba5b5eca04672eab7bf11d17c465f501e Add tests
095c4b884e7fa2625e38781336a113c100ee2a21 Add contexts,pages,services
54c3f8ddbf018bb892785cab42adc2e3537b662f Add twig and translation
71791c997dd496eaa5413b5858816abdba698e5e Fixes

Sylius/SyliusUiBundle,Sylius/SyliusUiBundle