tests fix, removed builds for 7.10 & 8.0, pg 10, travis xenial base image

Author: qz

stack-ghc7.10.3.yaml

@@ -5,7 +5,7 @@ import Data.Foldable
 import Control.Monad
 import Data.Maybe
 import Data.Int
-import Data.Either
+import Data.Either hiding (fromRight)
 import qualified Data.ByteString as B
 import qualified Data.ByteString.Lazy as BL
 import qualified Data.ByteString.Char8 as BS

stack-ghc8.0.2.yaml

@@ -39,7 +39,7 @@ testConnection name confContent = testCase name $ withPghba confContent $
         }
 
 pghbaFilename :: FilePath
-pghbaFilename = "/etc/postgresql/9.5/main/pg_hba.conf"
+pghbaFilename = "/etc/postgresql/10/main/pg_hba.conf"
 
 withPghba :: B.ByteString -> IO a -> IO a
 withPghba confContent action = do