Sanitize input to LDAP authentication module

workaround for reverse proxy, ssh, submodule

Update docker `socat` link creation

- Remove port 80 & 443 unused by the container
- Add port 3000 used by gogs application

- `start.sh` will now verify that the port is not already used by another service
- Resolve #1807
- Log when a service is created, or could not be created
- Keep track of which port is already used, including goes & sshd port

fix build error with PKGBUILD (archlinux, x64)

fix build error with PKGBUILD (archlinux)

Fix import path

Simplify disable Gravatar preference wording

"Enable this to disable..." is needlessly confusing, simplify it by being
upfront that this setting disables the Gravatar fetching.

fix typo in README for Docker

Fix bug introduced in #1759 preventing ssh server to launch

- ssh/setup: test directive now check if a file exist in key path instead of a folder
- ssh/setup script was hanging waiting for an input about rewriting the key
  as the test case was returning true, when it should have been false
  (check if file is a folder instead of a file)

Docker repository path backward compatibility fix

- resolve #1765
- create link to old git repository path: `/home/git/gogs-repository`

Volumed data setup changed to allow #1759

- Volumed subfolder now created up in the ENTRYPOINT script, this way
  they are created before S6 even starts making VOLUME.
- The subfolder will be created during VOLUME creation too as ENTRYPOINT
  script will be run before /bin/true
- SSH Keys will now be created on a single key basis not replying on the
  existence of /data/ssh folder

Docker Container Restart Fix