SERVER-12061 optionally abort cloner when corruption detected from source

(cherry picked from commit 6556243ff038a3f9cdc52e6a97684203c8c9ec54)

Conflicts:
	src/mongo/db/cloner.cpp
SERVER-12061 fix assert code

(cherry picked from commit 525b5ef94f72c376c4d831539be3988b8ff0a0ec)
SERVER-12061 massert on failure

(cherry picked from commit 5a74508369bfb820b18746623708688a76ae3419)