CHANGES from original schema upgrad files:

- We created the 'image' role in 1.11 -> removed

- A user nobody need to exist with id=1 -> insert into users (id,name,password,status,usertype,krb_principal) VALUES (1, 'nobody', '',0,0,''); was executed on production database.

- A deleted constrain in 1.15 -> 1.16, didn't exist -> commented out. (-- ALTER TABLE host_channels DROP CONSTRAINT host_channels_host_id_channel_id_key;

)