Update github.com/vishvananda/netlink to v1.1.0

Latest version allows to set a VRF device as master and not only
a bridge one.

Signed-off-by: Federico Paolinelli <fpaoline@redhat.com>

vendor/github.com/vishvananda/netlink/.travis.yml

@@ -2,6 +2,7 @@ language: go
 go:
   - "1.10.x"
   - "1.11.x"
+  - "1.12.x"
 before_script:
   # make sure we keep path in tact when we sudo
   - sudo sed -i -e 's/^Defaults\tsecure_path.*$//' /etc/sudoers
@@ -15,3 +16,4 @@ before_script:
   - sudo modprobe sch_hfsc
 install:
   - go get github.com/vishvananda/netns
+go_import_path: github.com/vishvananda/netlink