Sebastiaan van Stijn 20fccac6f6 Dockerfile: Use APT_MIRROR for security.debian.org as well
The fastly cdn mirror we're using also mirrors the debian security
repository;

```
Welcome to deb.debian.org (fastly instance)!

This is deb.debian.org. This service provides mirrors for the following Debian archive repositories:

/debian/
/debian-debug/
/debian-ports/
/debian-security/
The server deb.debian.org does not have packages itself, but the name has SRV records in DNS that let apt in stretch and later find places.
```

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit c8f43b5f6f7c83cfb5570f7f013c7efaa430d285)
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

Conflicts:
 * Dockerfile (GO_VERSION value differs, and CROSS (#39010) is absent)

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: 6e603e957eec3a46db4d8d69c3a7946c4d2e9c59
Component: engine
2019-07-26 12:40:28 -07:00
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