Add git-lfs to the awx_task container

[pasta88]

I think it would be good idea to add git-lfs package into awx_task container. I believe some users use it.

[jerosa]

This would be really helpful, just the installation of git-lfs inside the containers will be enough.

Currently as a workaround once you run the docker-compose, we execute yum install git-lfs in all "awx_task" containers. However we need to check the "delete on update" checkbox in all the projects created in AWX to ensure that the repository is being cloned with LFS installed.

[jetxeberria]

Making LFS available when AWX starts will be really useful due 2 reasons:

• prevent the activation of LFS by sending commands to containers
• prevent repository deleting and cloning before launching every template