Reduces the SNMP stats poll interval from 1 minutes to 1 second
Reduces the probability of a race condition between the calculation of spiral/histogram metrics and SNMP stat cache refresh by reducing the SNMP poll interval to 1 second during test execution
Merge pull request #702 from basho/jsb/reduce-snmp-poll-interval

Reduce the SNMP stats poll interval form 1 minute to 1 second