A containerless project should not require lxc to be installed

[David Ames]

With a containerless project lxc should never get called and not have to be installed.

sudo: lxc-ls: command not found
2017-08-31 16:42:44 [ERROR] Error calling external process
Traceback (most recent call last):
  File "/home/ubuntu/bot-control/tools/mojo-openstack/.tox/mojo/local/lib/python2.7/site-packages/mojo/cli.py", line 622, in run_with_args
    args.func(args)
  File "/home/ubuntu/bot-control/tools/mojo-openstack/.tox/mojo/local/lib/python2.7/site-packages/mojo/utils.py", line 305, in wrapped
    return method(*args, **kwargs)
  File "/home/ubuntu/bot-control/tools/mojo-openstack/.tox/mojo/local/lib/python2.7/site-packages/mojo/cli.py", line 340, in run_from_manifest
    project = mojo.project.Project(project_name, args.series, args.mojo_root)
  File "/home/ubuntu/bot-control/tools/mojo-openstack/.tox/mojo/local/lib/python2.7/site-packages/mojo/project.py", line 107, in __init__
    self.container = container_class(self.name, self.series)
  File "/home/ubuntu/bot-control/tools/mojo-openstack/.tox/mojo/local/lib/python2.7/site-packages/mojo/contain.py", line 408, in __init__
    Container.__init__(self, name, series, ensure_exists)
  File "/home/ubuntu/bot-control/tools/mojo-openstack/.tox/mojo/local/lib/python2.7/site-packages/mojo/contain.py", line 82, in __init__
    if self.defined:
  File "/home/ubuntu/bot-control/tools/mojo-openstack/.tox/mojo/local/lib/python2.7/site-packages/mojo/contain.py", line 713, in defined
    return self.check_state()
  File "/home/ubuntu/bot-control/tools/mojo-openstack/.tox/mojo/local/lib/python2.7/site-packages/mojo/contain.py", line 572, in check_state
    containers = subprocess.check_output(cmd).split()
  File "/usr/lib/python2.7/subprocess.py", line 574, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
CalledProcessError: Command '('sudo', 'lxc-ls', '-1')' returned non-zero exit status 1

[Tom Haddon (mthaddon)]

I agree we shouldn't fail if it's not installed, but we will have to try calling it to see what projects have been created, and then just move on if not available.