[tests/ring] Remove sleeps. Fix bugs in test (don't know how it ever worked).
[tests/ring] Remove sleeps. Fix bugs in test (don't know how it ever worked).

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