Monitor attachment fd's in all cases
Monitor attachment fd's in all cases

Of course there are three separate paths to retrieve attachment
bodies, so let's monitor the Fd in all of them.

BugzID: 16492

Conflicts:
	src/chttpd_db.erl

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb