Updates to dependent libraries

Below dependent libraries are updated to latest version.

• client-go
• nlgo
• gobgp

Changelog

33dc111 Merge pull request #62 from cloudnativelabs/gobgp-1.20
8b5d81c gobgp bump to master
2bdf657 gobgp client in kube-router docker image does not show peer information
dec6bfa Fix logging to stderr (#61)
1633b76 Merge pull request #60 from cloudnativelabs/fix-glog-goflag
78a0aeb Apply glog/goflag noisy log workaround Fixes #59 kubernetes/kubernetes#17162
dca10e9 daemonset: Critical pod, toleration, and standardization improvements (#56)
37d4192 Merge pull request #55 from cloudnativelabs/update-vendor-go
dd7cd65 Use pflag only
510d18c Update vendored dependencies
49147bb build: Upgrade to go 1.8.x
b874540 policy-controller: Don't check for depreciated LegacyHostIP
a5ce7cc Update client-go, nlgo and dependencies This is to support k8s v1.7 and beyond Also to get a bugfix from nlgo

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