Pin ARA to <1.0.0 and use stable setup interface to find callback plugin

ARA 1.0 will be released in the near future and isn't backwards
compatible. Pin it so it doesn't break things unexpectedly.

ARA ships simple setup modules to help figure out the paths
to where things are located.
These are backwards compatible from ARA 1.0 to 0.x.

Change-Id: I3fe3f4082279c2fd9a629605619a97aa5f5b0b73