Remove LFS objects when removing a project

Currently when I remove a project the repository will be deleted from the file system but the LFS objects not.

Using GitLab Community Edition 8.3.2 fbb8b6e6

Summary

Remove LFS objects when removing a project. Currently when I remove a project the repository will be deleted from the file system but the LFS objects not.

Steps to reproduce

1. Create a new or use an existing project
2. Add and push LFS objects to this repository
3. Remove the project and you can see the files left behind in /var/opt/gitlab/git-data/lfs-objects

Expected behavior

LFS objects deleted when a project is removed.

Relevant logs and/or screenshots

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Output of checks

Results of GitLab Application Check

Checking GitLab Shell ...

GitLab Shell version >= 2.6.9 ? ... OK (2.6.9)
Repo base directory exists? ... yes
Repo base directory is a symlink? ... no
Repo base owned by git:git? ... yes
Repo base access is drwxrws---? ... yes
hooks directories in repos are links: ... 
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Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Check GitLab API access: OK
Check directories and files: 
	/var/opt/gitlab/git-data/repositories: OK
	/var/opt/gitlab/.ssh/authorized_keys: OK
Test redis-cli executable: redis-cli 2.8.21
Send ping to redis server: PONG
gitlab-shell self-check successful

Checking GitLab Shell ... Finished

Checking Sidekiq ...

Running? ... yes
Number of Sidekiq processes ... 2
  Try fixing it:
  sudo service gitlab stop
  sudo pkill -u git -f sidekiq
  sleep 10 && sudo pkill -9 -u git -f sidekiq
  sudo service gitlab start
  Please fix the error above and rerun the checks.

Checking Sidekiq ... Finished

Checking Reply by email ...

Reply by email is disabled in config/gitlab.yml

Checking Reply by email ... Finished

Checking LDAP ...

LDAP is disabled in config/gitlab.yml

Checking LDAP ... Finished

Checking GitLab ...

Git configured with autocrlf=input? ... yes
Database config exists? ... yes
Database is SQLite ... no
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config outdated? ... no
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory setup correctly? ... yes
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
projects have namespace: ... 
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Redis version >= 2.8.0? ... yes
Ruby version >= 2.1.0 ? ... yes (2.1.7)
Your git bin path is "/opt/gitlab/embedded/bin/git"
Git version >= 1.7.10 ? ... yes (2.6.1)
Active users: 9

Checking GitLab ... Finished

Results of GitLab Environment Info

System information
System:		Ubuntu 14.04
Current User:	git
Using RVM:	no
Ruby Version:	2.1.7p400
Gem Version:	2.5.1
Bundler Version:1.10.6
Rake Version:	10.4.2
Sidekiq Version:4.0.1

GitLab information
Version:	8.3.2
Revision:	fbb8b6e
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	postgresql
URL:		https://git....
HTTP Clone URL:	https://git....
SSH Clone URL:	git@git....
Using LDAP:	no
Using Omniauth:	no

GitLab Shell
Version:	2.6.9
Repositories:	/var/opt/gitlab/git-data/repositories
Hooks:		/opt/gitlab/embedded/service/gitlab-shell/hooks/
Git:		/opt/gitlab/embedded/bin/git

Possible fixes

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