test/bench: use uint64_t for uniform distribution

int is too small for rbd image sizes

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
test/bench: don't alias bl from above

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
test/bench: add rbd backend to smalliobench

Only supports format 1 images to start, and does not issue flushes, so
it's best used with caching off.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
packaging: add smalliobenchrbd

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
Merge remote-tracking branch 'gh/wip-rbd-bench'

Conflicts:
	ceph.spec.in
	debian/ceph-test.install
	src/.gitignore
qa: smalliobenchrbd workunit

Run a bunch of parallel smalliobenchrbd processes.

Signed-off-by: Sage Weil <sage@inktank.com>