[ONOS-3737] Bump up checkstyle version from 2.16 to 2.17 with some compilation fixes

Change-Id: I3ade52ff15b3114f5748ab3151c02c8c74af38f0
diff --git a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/IPv6AddressTlv.java b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/IPv6AddressTlv.java
index 087cd5c..9ad8759 100644
--- a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/IPv6AddressTlv.java
+++ b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/IPv6AddressTlv.java
@@ -110,7 +110,7 @@
      * @param type says Ipv6 address of interface/neighbor tlv type
      * @return object of this class
      */
-    public static IPv6AddressTlv of(final Ip6Address address , final short type) {
+    public static IPv6AddressTlv of(final Ip6Address address, final short type) {
         return new IPv6AddressTlv(address, type);
     }