Fix build: update build tools version from 23 to 23.0.1
Fix build: update build tools version from 23 to 23.0.1

* What went wrong:
A problem occurred configuring project ':CosuApp'.
> failed to find Build Tools revision 23.0.0

Build tools package revision has been updated to 23.0.1
in ag/772430.

Change-Id: I1b7dadf992502a9011b81ba1dbe070f80f77d3fd

googlesamples/android-testdpc,googlesamples/android-testdpc