fix end of month bug in PeriodDropRule as well

server/src/main/java/com/metamx/druid/master/rules/PeriodDropRule.java

@@ -56,7 +56,7 @@ public class PeriodDropRule extends DropRule
   @Override
   public boolean appliesTo(DataSegment segment, DateTime referenceTimestamp)
   {
-    final Interval currInterval = new Interval(referenceTimestamp.minus(period), period);
+    final Interval currInterval = new Interval(period, referenceTimestamp);
     return currInterval.contains(segment.getInterval());
   }
 }

server/src/test/java/com/metamx/druid/master/rules/PeriodDropRuleTest.java

@@ -79,6 +79,13 @@ public class PeriodDropRuleTest
             now
         )
     );
+    Assert.assertTrue(
+        rule.appliesTo(
+            builder.interval(new Interval(now.minusDays(1), now))
+                   .build(),
+            now
+        )
+    );
     Assert.assertFalse(
         rule.appliesTo(
             builder.interval(new Interval(now.minusYears(1), now.minusDays(1)))