repair gnocchi dockerfile

1. Add the missing packages in the gnocchi image
   packages: lz4 sqlalchemy_utils gnocchiclient

2. gnocchi config path is error
   gnocchi config path is /gnocchi/etc/gnocchi

3. gnocchi sync db command is error
   sync db command is: gnocchi-upgrade
   Reference link: http://docs.openstack.org/developer/gnocchi/install.html

4. gnocchi log directory is /var/log/kolla/gnocchi

5. Add gnocchi-api running as a mod_wsgi
   Reference link: http://docs.openstack.org/developer/gnocchi/running.html

6. Add gnocchi sudoers file

Closes-Bug: #1607332

Change-Id: Id3aded82706ffd204373c97a020980d0d9b72663