net/http: add disabled test for Body Read/Close lock granularity
net/http: add disabled test for Body Read/Close lock granularity

Update Issue 7121

R=golang-codereviews, gobot, dsymonds
CC=golang-codereviews
https://codereview.appspot.com/51750044

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang