Adds service name valid indicator

Adds service name valid indicator

When deploying a charm the service name input box will
now show you a checkmark or x depending on other services
currently deployed.

https://code.launchpad.net/~hatch/juju-gui/service-name-1221668/+merge/185916

(do not edit description out of merge proposal)

[jeff.pihach, 2013-09-16 19:52:18]

Please take a look.

[gary.poster, 2013-09-16 20:31:09]

LGTM and qa ok.

As discussed, I'd like to see the " 1" removed, ideally.

As also discussed, this exposed a serious pre-existing bug:

 1) create ghost. (do *not* deploy.) let's say you named it ceph4
 2) create second ghost & try naming it the same thing. what should happen:
service stays around. what happens: service disappears and then world breaks.

[jeff.pihach, 2013-09-16 21:31:01]

*** Submitted:

Adds service name valid indicator

When deploying a charm the service name input box will
now show you a checkmark or x depending on other services
currently deployed.

R=gary.poster
CC=
https://codereview.appspot.com/13253056