fix(glide): pin the k8s client dep

[arschles]

also adds an ignore for the large and unnecessary ’docker/distribution’ dependency.

@krancour I was unable to produce a dependency failure with either of the two approaches:

• glide install on the host:
  • rm -rf vendor ~/.glide/cache && glide install
• make bootstrap:
  • rm -rf vendor && make bootstrap

[krancour]

This is working for me now.