Migrate to collectd baseami and make use of ebslvm

This new baseami includes collectd logging to our hostedgraphite
instance. This'll permit us to monitor system level stats on our edge
tier.

Additionally we're now writing to an lvm which spans two ebs volumes,
which in theory should give us more reliable write performance. Though
there is a follow up task to ensure we're launching EBS-optimized
instances (which isn't currently the case).

I have tested this in the integration cluster; I can confirm that spade_edge starts.