SERVER-15907 Use ftuncate rather than fallocate on linux tmpfs

This means we don't use any ram for unused portions of files.
SERVER-15684 Make copydb work with SCRAM (SASL)
SERVER-15890 Fix initial sync from 2.6 node by setting slaveOk bit where necessary
SERVER-15598 Use dynamic dependencies for enterprise .debs
Remove mongo-tools now built in go from .gitignore
SERVER-15900: secondaries should stripe writes by doc if doc locking is on
SERVER-13635: add isDurable to StorageEngine and use for GLE
SERVER-15819: fix privilege check on currentOpCtx
index sizing
SERVER-13635: allow kv engines to get index sizes pass through
Merge remote-tracking branch 'nextdoor/master'

Conflicts:
	src/mongo/db/storage/devnull/devnull_kv_engine.h
	src/mongo/db/storage/heap1/heap1_engine.h