Enable running all tests via "installcheck"

NOTE: also makes CDB_TableMetadata triggers still functional
      when user quota and varnish invalidation functions are missing
      from the database (currently installed by cartodb ruby)

scripts-available/CDB_Quota.sql

@@ -35,7 +35,12 @@ BEGIN
 
   IF dice < pbfact THEN
     RAISE DEBUG 'Checking quota on table % (dice:%, needed:<%)', TG_RELID::text, dice, pbfact;
-    qmax := public._CDB_UserQuotaInBytes();
+    BEGIN
+      qmax := public._CDB_UserQuotaInBytes();
+    EXCEPTION WHEN undefined_function THEN
+      RAISE WARNING 'Missing _CDB_UserQuotaInBytes(), assuming no quota';
+      RETURN NEW;
+    END;
     SELECT CDB_UserDataSize() INTO quota;
     IF quota > qmax THEN
         RAISE EXCEPTION 'Quota exceeded by %KB', (quota-qmax)/1024;

scripts-available/CDB_TableMetadata.sql

@@ -82,7 +82,11 @@ BEGIN
   --
   --  LISTEN cdb_tabledata_update;
   --
-  PERFORM cdb_invalidate_varnish(tabname);
+  BEGIN
+    PERFORM cdb_invalidate_varnish(tabname);
+  EXCEPTION WHEN undefined_function THEN
+    RAISE WARNING 'Missing cdb_invalidate_varnish()';
+  END;
 
   RETURN NULL;
 END;

scripts-available/CDB_UserTables.sql

@@ -22,7 +22,7 @@ AS $$
       'spatial_ref_sys'
      )
   ), perms AS (
-    SELECT t, has_table_privilege('publicuser', 'public.'||t, 'SELECT') as p
+    SELECT t, has_table_privilege('publicuser', t, 'SELECT') as p
     FROM usertables
   )
   SELECT t FROM perms