Add tests around the bloom ruin and check options
Add tests around the bloom ruin and check options

This generally improves our test coverage of bloom filter behavior and
more specifically makes sure that check and ruin do something.

Signed-off-by: Brandon Low <a52c3838af000af4c7c0bc518c135eded66d273a@lostlogicx.com>

jbaber/bup,gevaerts/bup,pombredanne/bup,tjanez/bup,pombredanne/bup,jbaber/bup,apenwarr/bup,ToxicFrog/bup,mhoeher/bup,apenwarr/bup,apenwarr/bup,ToxicFrog/bup,mhoeher/bup,gevaerts/bup,tjanez/bup,gevaerts/bup,ToxicFrog/bup,pombredanne/bup,ToxicFrog/bup,pombredanne/bup,mhoeher/bup,tjanez/bup,tjanez/bup,pombredanne/bup,gevaerts/bup,pombredanne/bup,tjanez/bup,tjanez/bup,jbaber/bup,mhoeher/bup,jbaber/bup,gevaerts/bup,apenwarr/bup,ToxicFrog/bup,jbaber/bup,jbaber/bup,mhoeher/bup,mhoeher/bup