The dev build is far simpler than the release build, so move it to its
own shell script. This simplifies the release build script slightly as
well at the cost of duplicating the version/tag logic.
Also don't even try to check for LXC if not running on Linux. I don't
think we want to try to support cross-compiling LXC from non-Linux
hosts.
We recently ran into an issue on a small percentage of nomad-clients
where the nomad-client was running successfully, but due to a race
condition, could not correctly bind to the docker socket. This caused
all of our nomad jobs to be allocated to a single nomad-client instead
of being spread evenly across our clients. The only way to discover this
was to run `nomad node-status <node>` and count each job allocation per
node.
This can lead to a fairly long debugging process if there are several
nomad-clients. Including the number of allocations for each node in the
`node-status` command would save a large amount of debug time.
```
jake@biscuits [12:08:41] [~]
-> % nomad node-status
ID Datacenter Name Class Drain Status Allocations
2b0aabc5 dc1 biscuits <none> false ready 0
```
```
jake@biscuits [12:08:55] [~]
-> % nomad node-status
ID Datacenter Name Class Drain Status Allocations
2b0aabc5 dc1 biscuits <none> false ready 1
```
