[source] umdns: update to latest git HEAD

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/00e9a7aacb66b3f00df2002e8210bdb5086d2e0c

commit 00e9a7aacb66b3f00df2002e8210bdb5086d2e0c
Author: John Crispin <john at phrozen.org>
AuthorDate: Thu Sep 28 09:27:39 2017 +0200

    umdns: update to latest git HEAD
    
    b84fdac Add debug output for service_timeout
    8f7e3bc Remove incorrect comma in http service json config
    9f40133 Remove ttl==255 restriction for queries
    
    Signed-off-by: John Crispin <john at phrozen.org>
---
 package/network/services/umdns/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/package/network/services/umdns/Makefile b/package/network/services/umdns/Makefile
index cdafa5b..5188ac5 100644
--- a/package/network/services/umdns/Makefile
+++ b/package/network/services/umdns/Makefile
@@ -12,9 +12,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_URL=$(LEDE_GIT)/project/mdnsd.git
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_DATE:=2017-05-22
-PKG_SOURCE_VERSION:=0e8b948ff8dd1cb1763180c99b522390529c7841
-PKG_MIRROR_HASH:=1cdd25464e1be69bef56092bc8547ba254ffc2d7c32f13cf02a80c8742876f1b
+PKG_SOURCE_DATE:=2017-09-28
+PKG_SOURCE_VERSION:=b84fdacb6e9f8f9d4b588db0ef191eba9bd99af9
+PKG_MIRROR_HASH:=e2f64d307a64eb12bcfb21077312850e672dd02a6ad7b3b139909a5dfaa1e906
 
 PKG_MAINTAINER:=John Crispin <john at phrozen.org>
 PKG_LICENSE:=LGPL-2.1