Code review comment for lp:~thumper/juju-core/really-unit-agent-proxy-settings

New to lose the global proxy vars. But bigger issue is a missing end-end
test to ensure we can make a change it state and it is propagated
through and used next time a hook is run.

https://codereview.appspot.com/53240044/diff/1/worker/uniter/proxy.go
File worker/uniter/proxy.go (right):

https://codereview.appspot.com/53240044/diff/1/worker/uniter/proxy.go#newcode16
worker/uniter/proxy.go:16: proxyMutex sync.Mutex
Please move these from being global to attrs on Uniter

https://codereview.appspot.com/53240044/diff/1/worker/uniter/proxy.go#newcode26
worker/uniter/proxy.go:26: func UpdatePackageProxy(cfg *config.Config) {
This could then be moved as well.

https://codereview.appspot.com/53240044/