Address API council feedback.

Bug 37636027

Change FragmentTransaction#setAllowOptimization() to
FragmentTransaction#setReorderingAllowed().

Framework Change: I24c35aad95ffa14d2e2fa092ae71d3d459e6d648
Test: ran fragment cts tests
Change-Id: I729dc05bde1f6eba6ff8d38eb15f65de777c14bb
5 files changed