DOCS-1512 fix eval params/fields

Signed-off-by: Sam Kleinman <samk@10gen.com>
build: helper function for merging patches
Alters iostat

"iostat -xmt 1" should be used as this allows:

t -  timestamp
1 - per second resolution

And is more inline with the output for Mongostat

Signed-off-by: Sam Kleinman <samk@10gen.com>