Add API func ShareEnvironment to client and server API:

ShareEnvironment shares the current environment with the given user.
Under the hood, it adds an environment user to state.
juju/testing: don't remove admin user in JujuConnSuite

We no longer enable mongo auth in our tests, so there's
no need for the "soft resetting" anymore.
use lumberjack for log rolling
Merge pull request #512 from natefinch/lumberjack

use lumberjack for log rolling

This is very similar to the last PR, except I didn't change out the upstart config stuff... since the output redirect doesn't hurt anything, and we need the rest of the code to properly set permissions and owner on the logfile.
Merge branch 'master' of https://github.com/juju/juju into share-env-take2
Merge branch 'master' of https://github.com/juju/juju into share-env-take2
Merge pull request #645 from waigani/share-env-take2

New client & server API func ShareEnvironment

ShareEnvironment shares the current environment with the given user.
Under the hood, it adds an environment user to state.
move the tests inline
Remove the user checking for the keymanager.
Merge pull request #688 from axw/jujuconnsuite-dont-remove-admin

juju/testing: don't remove admin user in JujuConnSuite

We no longer enable mongo auth in our tests, so there's
no need for the "soft resetting" anymore.
Update names dependency.
Core changes to store tools in state
Search, download and cache tools from public/configured tools sources

FindTools will now search simplestreams unless an exact match is
being performed and that is found in toolstorage. Tools found in
toolstorage will take precedence over those in simplestreams.

If a tools version is requested for download and it is not in
toolstorage already, the API server will search for it in simplestreams,
download it, and cache it in toolstorage before returning it to
the client.

Also, we now once again (as in 1.20) only clone tools on upload if
requested. We will drop the "AddToolsAlias" function from toolstorage.
cmd/jujud: clone tools, don't alias metadata
Fix apiserver tools serving
Fix tests
Merge pull request #692 from howbazaar/refactor-perm-test

Move the tests inline

Refactoring the test to allow for a smaller diff later when we change the user tags.

This change just moves the tests and the variables to be in the test function.
Merge pull request #694 from howbazaar/update-names

Update names dependency.

Just bring in the latest names changes.
Remove DisplayName option

Remove the option to set an environ user's display name from the
AddEnvirionmentUser function. Update call sites and expected test
results.
Merge pull request #693 from howbazaar/keymanager-updates

Remove the user checking for the keymanager.

The existing keymanager tests for specific users are skipped, but not removed.
I expect that sometime in the near future we will have keys stored for users, but we are not doing that just yet.