Add support for jitsu deploy-to.

Add support for jitsu deploy-to.

The charm already worked well when deployed in the bootstrap node using
the 'jitsu deploy-to' command. This branch adds a test for this behavior.

Other changes:

Slightly simplified how the staging option is retrieved in the start hook.

Fixed tests by changing the juju-gui upstart configuration file. Before
this change it was not possible for upstart to correctly stop the juju-gui
service, because upstart itself was not able to keep track of the PID.

Fixed the install hook: it was not idempotent (and the tests were broken
for this reason too).

https://code.launchpad.net/~frankban/charms/precise/juju-gui/bug-1086788-jitsu-deploy-to/+merge/139526

(do not edit description out of merge proposal)

[frankban, 2012-12-12 17:45:00]

Please take a look.

[matthew.scott, 2012-12-12 19:01:42]

Approved for me, no additional changes.

Thanks for the changes, I think there's a lot of really good clean-up with this
branch.  Especially the upstart conf file for the GUI - I'll have to keep that
in mind.

[gary.poster, 2012-12-12 20:21:35]

Land as is.

Looks great, Francesco.  Thank you.

Gary

[frankban, 2012-12-13 08:42:16]

Hi Gary and Matthew,

thanks for the reviews.

[frankban, 2012-12-13 08:43:10]

*** Submitted:

Add support for jitsu deploy-to.

The charm already worked well when deployed in the bootstrap node using
the 'jitsu deploy-to' command. This branch adds a test for this behavior.

Other changes:

Slightly simplified how the staging option is retrieved in the start hook.

Fixed tests by changing the juju-gui upstart configuration file. Before
this change it was not possible for upstart to correctly stop the juju-gui
service, because upstart itself was not able to keep track of the PID.

Fixed the install hook: it was not idempotent (and the tests were broken
for this reason too).

R=matthew.scott, gary.poster
CC=
https://codereview.appspot.com/6929057