Set SELinux context type

Changes in the target SELinux policy in CentOS 6.6 prevent the sshd_t context from reading the var_t context, the
default context on /var/opt/gitlab/.ssh. This prevents sshd from reading the authorized_keys files, denying access to the server.
Merge branch 'hotfix/selinux'
Merge tag 'selinux' into develop

1.1.3