Remove loadleveler support

[hppritcha]

loadleveler is no longer being maintained by IBM and no appears to be willing to support it. So time for it to be removed as a orte/ras component.

@gpaulsen

[gpaulsen]

I asked internally to see if we have any legacy machines to test on.
Going forward IBM is not interested in maintaining support, but if we can find some internal resources we can test one time to determine it's current state.

[hppritcha]

Waiting for testing results from IBM.

[hppritcha]

any updates on IBM testing?

[hppritcha]

any updates from IBM?

[gpaulsen]

I still haven't tested yet. I'll try to get it done this week, but I still need access to this older test cluster.