get_put_monitor_eqc test failure

[vinoski]

On a slow smp:2:2 Fedora buildbot box, the get_put_monitor_eqc test fails reliably with this error:

Reason: {invariant,
       [{{riak_kv, node, puts, fsm, active}, {expected, 0},
         {actual, -1}}]}
*failed*
in function get_put_monitor_eqc:'-eqc_test_/0-fun-2-'/1 (test/get_put_monitor_eqc.erl, line 36)
**error:{assertEqual_failed,[{module,get_put_monitor_eqc},
                     {line,36},
                     {expression,"quickcheck ( eqc : testing_time ( 90 , ? QC_OUT ( prop ( ) ) ) )"},
                     {expected,true},
                     {value,false}]}