SERVER-14425 Add MMAP V1 check to invariant
SERVER-13635: fix typo in _recordStore
SERVER-13635: abstract storagesize per db for listDatabases
SERVER-13635: make capped dbtests more generic
SERVER-13635: move mmapv1 specific test to right place
increase number of concurrent sessions
SERVER-13635: make some replset tests generic
SERVER-13635: fix rollback using system.namespaces
Merge remote-tracking branch 'nextdoor/master'

Conflicts:
	src/mongo/db/storage/kv/kv_collection_catalog_entry.h
merge stuff