The previously hardcoded lxc path prevented the sudo wrapper from
working in environment with alternative `lxcpath`.
I had to move `sudo_wrapper` from `provider` to `LXC` because the
concept of "provider" is tied to a machine when a command sush as
`sudoers` is not.
Fixes#413 and #399
The LXC provider issues the "fetch_ip" action to look up the IP address
of the container as part of its "ssh_info" action.
Vagrant::LXC::Action.action_fetch_ip checks the machine state using
Builtin::IsState, which calls Vagrant::Machine.state, which also updates
the state in the machine index and acquires a machine index entry lock to do that.
A race condition ensues in WaitForCommunicator.call, where ready_thr tries
to acquire the machine index lock while running ssh_info, and states_thr tries
to acquire the same lock doing its own state look up (env[:machine].state.id).
If they both try to acquire the lock at the same time, one will fail, and
an exception will be raised.
Work around this issue by checking for the desired machine state (:running) in
Vagrant::LXC::Provider.ssh_info, which can get the state from
Vagrant::LXC::Provider.state, which in turn does not write out the state into
the index file and does not acquire the index entry lock.
Sudoers now creates a safe wrapper script that performs sanity checks on sudo :
* wrapper generated in /usr/local/bin (name includes version to allow multiple wrappers on the same system)
* sudoers command now generates a one-line file in /etc/sudoers.d
* SudoWrapper use the new wrapper
* Removed unused Config#validate method
