Add basic performance smoke test

This is a simple tool meant to be a sanity check for whether a change to
Riak causes a severe performance degradation in the main KV code paths.
Avoid rebuilding perfdev dir on each run
make perfdev a staged node
- tweak test times
- add saturation test
- reorder tests
- make warmup more intense
finish merge still slightly broken
Merge remote-tracking branch 'origin/develop' into eas-pevm-basic-perf-test

Conflicts:
	rel/files/riak.schema
more wip brokenness
add lockcount support and change to standard rand as crypto rand
becomes unhappy on machines with a higher core count
Merge pull request #380 from basho/eas-pevm-basic-perf-test

update engel's basic perf test for cuttlefish