This counts the open file handles and inodes. This may be useful
(after establishing a baseline) for evaluating ulimit errors.
Change-Id: I6d5c67d7c5c03d4aa7cd88b2238163cc729d9782
Dstat is dead, but pcp supplies a compatible interface.
Installation can be unreliable, so let's ignore failures since
this isn't generally critical.
Change-Id: I9234b226242f145db9c235797649202aa530ec74