Update juju/testing dependency

Fixes LP #1325707.
networker API facade
fix dependencies
remove extra files
split SetUpTest functions
fix comment
minor fixes
utils: remove most of it and use juju/utils instead.

utils/ssh and utils/syslog remain in core pending removal of their
core dependencies.

This is a mechanical change.
add juju/utils dependency
Merge pull request #16 from klyachin/118-networker-facade

api: new Networker API facade

The original task was:
"new Networker API facade (client/server) with ListVLANsForMachine API call"
The additional tas was:
"Networker API" should do all network setup staff done by cloud-init

But all thing are changing and now Networker API has the only method calld
MachineNetworkInfo(machineTag string) ([]network.Info, error).
Merge remote-tracking branch 'origin/master' into 002-move-utils
fix up imports after merge
fix accidental merge issue with pull request #16

https://github.com/juju/juju/pull/16
Merge pull request #32 from johnweldon/fix-mr-16

https://github.com/juju/juju/pull/16
here's your \t
merge from trunk
Merge pull request #10 from davecheney/101-update-juju-testing-dependency

Fixes LP #1325707.
Use github.com/juju/names package

Also remove unnecessary usage of errors package when fmt was already imported.
Fix test imports
Update dependencies.tsv