Add some wtperf workloads that turn logging on.
Merge pull request #1415 from wiredtiger/wtperf-log-workloads

Add some wtperf workloads that turn logging on.
Fixup wtperf config documentation.
Add a statistic to count how much eviction application threads are doing.
Merge branch 'develop' into split-right

Conflicts:
	src/include/wiredtiger.in