Fixes for maven central https URLs

Change-Id: I2eec039299c32d809b3eea6458471d8ec62b1cc8
diff --git a/tools/build/onos-buck b/tools/build/onos-buck
index 7dab646..a6a5caf 100755
--- a/tools/build/onos-buck
+++ b/tools/build/onos-buck
@@ -5,7 +5,7 @@
 
 set -e
 
-BUCK_URL="http://repo1.maven.org/maven2/org/onosproject/onos-buck/v2018.02.09.01/buck-v2018.02.09.01.zip"
+BUCK_URL="https://repo1.maven.org/maven2/org/onosproject/onos-buck/v2018.02.09.01/buck-v2018.02.09.01.zip"
 BUCK_SHA="45d8bd28f441991257babf89f7a317edb3a2b536"
 
 # onos-yang-tools buck plugin version