Improve the configuration parser tests.
Improve the configuration parser tests.

The simple host test was broken in that it expected the wrong set of
entity->instance mappings.  The region checker was incomplete.

hyc/HyperDex,vashstorm/HyperDex,cactorium/HyperDex,hyc/HyperDex,hyc/HyperDex,cactorium/HyperDex,pombredanne/HyperDex,UIKit0/HyperDex,tempbottle/HyperDex,pombredanne/HyperDex,tempbottle/HyperDex,tempbottle/HyperDex,jtk54/HyperDex,rescrv/HyperDex,rescrv/HyperDex,UIKit0/HyperDex,hyc/HyperDex,tempbottle/HyperDex,cactorium/HyperDex,tempbottle/HyperDex,vashstorm/HyperDex,jtk54/HyperDex,rescrv/HyperDex,hyc/HyperDex,UIKit0/HyperDex,tempbottle/HyperDex,UIKit0/HyperDex,rescrv/HyperDex,tempbottle/HyperDex,UIKit0/HyperDex,pombredanne/HyperDex,UIKit0/HyperDex,rescrv/HyperDex,rescrv/HyperDex,jtk54/HyperDex,cactorium/HyperDex,vashstorm/HyperDex,cactorium/HyperDex,vashstorm/HyperDex,cactorium/HyperDex,vashstorm/HyperDex,cactorium/HyperDex,jtk54/HyperDex,vashstorm/HyperDex,pombredanne/HyperDex,pombredanne/HyperDex,UIKit0/HyperDex,vashstorm/HyperDex,pombredanne/HyperDex,jtk54/HyperDex,rescrv/HyperDex,cactorium/HyperDex,pombredanne/HyperDex,tempbottle/HyperDex,rescrv/HyperDex,jtk54/HyperDex,jtk54/HyperDex,cactorium/HyperDex,pombredanne/HyperDex,tempbottle/HyperDex,UIKit0/HyperDex,hyc/HyperDex,jtk54/HyperDex,jtk54/HyperDex,hyc/HyperDex,pombredanne/HyperDex,vashstorm/HyperDex,vashstorm/HyperDex,hyc/HyperDex,UIKit0/HyperDex,rescrv/HyperDex