Add validators to Image model
Add validators to Image model

Signed-off-by: Brian DeHamer <760e7dab2836853c63805033e514668301fa9c47@dehamer.com>

patocox/panamax-api,patocox/panamax-api,argvader/panamax-api,argvader/panamax-api,xirun/panamax-api,TravisCannon/panamax-api,CenturyLinkLabs/panamax-api,patocox/panamax-api,argvader/panamax-api,xirun/panamax-api,xirun/panamax-api,rheinwein/panamax-api,rheinwein/panamax-api,TravisCannon/panamax-api,argvader/panamax-api,rheinwein/panamax-api,rheinwein/panamax-api,TravisCannon/panamax-api,CenturyLinkLabs/panamax-api,TravisCannon/panamax-api,patocox/panamax-api,CenturyLinkLabs/panamax-api,CenturyLinkLabs/panamax-api