[2470] reordered dns/ header files to check independence of rrcollator.h

as suggested in the review.

[2470] reordered dns/ header files to check independence of rrcollator.h
as suggested in the review.
15d0b77b · JINMEI Tatuya · 0e2ef3c7 · 15d0b77b
Commit 15d0b77b authored Dec 12, 2012 by JINMEI Tatuya
--- a/src/lib/dns/rrcollator.cc
+++ b/src/lib/dns/rrcollator.cc
@@ -14,9 +14,11 @@

 #include <exceptions/exceptions.h>

+// include this first to check the header is self-contained.
+#include <dns/rrcollator.h>
+
 #include <dns/name.h>
 #include <dns/rdataclass.h>
-#include <dns/rrcollator.h>
 #include <dns/rrclass.h>
 #include <dns/rrtype.h>
 #include <dns/rrttl.h>