[tests/unit/cannon] Add printf at beginning of each iteration. Add asserts around CAPI calls.
[tests/unit/cannon] Add printf at beginning of each iteration. Add asserts around CAPI calls.

mit-carbon/Graphite-Cycle-Level,8l/Graphite,mit-carbon/Graphite-Cycle-Level,fhijaz/Graphite,victorisildur/Graphite,victorisildur/Graphite,mit-carbon/Graphite,victorisildur/Graphite,nkawahara/Graphite,nkawahara/Graphite,mit-carbon/Graphite-Cycle-Level,8l/Graphite,victorisildur/Graphite,nkawahara/Graphite,nkawahara/Graphite,fhijaz/Graphite,mit-carbon/Graphite,mit-carbon/Graphite,fhijaz/Graphite,8l/Graphite,mit-carbon/Graphite-Cycle-Level,8l/Graphite,mit-carbon/Graphite,fhijaz/Graphite