Adds the 'maas-bridge-interface' option to MAAS configuration
	- By default 'eth0' is used, but this fails on some setups like LP: #1271144 when
	using (p1p2, eth2, ..) interfaces.
- Minor fixes according to @wallyworld observations
Modified upstart config to ensure proper log perms.
Modified Upstart config to grant correct permissions to agent logs.
Merge branch 'master' of https://github.com/juju/juju into 1286518-log-perms-2
Updated tests to reflect use of script.
Corrected search for exec block to work with new script block.
Finally got tests working. Removed unnecessary panic.
Merge branch 'master' of https://github.com/juju/juju into 1286518-log-perms-2

Conflicts:
	environs/cloudinit/cloudinit_test.go
- Fixed according to @axw comment.
	- For backward-compatibility, network-bridge is an empty string by default "eth0" will be returned.
Merge pull request #245 from katco-/1286518-log-perms-2

1286518 log perms 2
Cleanup for new names.ActionTag refactor

hide implementation details more, rearrange code layout, simplify
Update the add machine api to accept both environment name and UUID.
Add a method to get the environment uuid from the client api connection.
Update dependencies.tsv
Use the environment uuid instead of the name.
Use the NewAPIClient method from the env command.
Port the plugins to not use EnvName.
Merge pull request #248 from davecheney/128-update-ssh-terminal

Update dependencies.tsv

Fixes https://bugs.launchpad.net/bugs/1337063
Merge pull request #249 from howbazaar/env-cmd-add-machine

Update add machine to use environment UUID

This is the start of the work to hide the EnvName from the environment command base.

This will allow us to specify an environment using either other command line parameters or environment variables to better allow scripts to call juju without having a $(JUJU_HOME)/environments directory.