ALLJOYN-1794 Increase number of IODispatch timer threads to 16.

Change-Id: Ifab3f9c839753e2d33afed2e8b0ed67568c15a60
Revert "ALLJOYN-1794 Increase number of IODispatch timer threads to 16."

This reverts commit 78c387c11cec2f3df07cc38b0fe77ea16c4c697e.

Change-Id: I52ee6d3f8d80334cc15e7f39b085721d711cf64a