vendor: add CNI invoke, ip, ipam, and hwaddr packages

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

@@ -0,0 +1,8 @@
+language: go
+before_script:
+  # make sure we keep path in tact when we sudo
+  - sudo sed -i -e 's/^Defaults\tsecure_path.*$//' /etc/sudoers
+  # modprobe ip_gre or else the first gre device can't be deleted
+  - sudo modprobe ip_gre
+install:
+  - go get github.com/vishvananda/netns