* fixing sentry3 temperature sensor issues: read all sensors not just first two, fix reading limit and current values, fixing snmp get options
* fixing sentry4 temperature sensor issues: read all sensors not just first two, fix reading limit and current values, fixing snmp get options
* fixing code style issues
* addressing review items from murrant, removing individual snmp_gets, fixing fahrenheit to celcius code back
* addressing review items, putting back the celcius fahrenheit conversion logic back
* using snmpwalk_cache_oid instead of reinventing in sentry3 code
* using pre-cache for sentry4 temp sensors, addressing review items
* checking all sentry3 humidity sensors instead of first two, bulk reading instead of individual gets
* addressing style issues
* pre-caching sentry4 humidity warning table removing duplicate temp sensor event config table
* adding two more sentry snmprec files after temperature and humidity sensor updates
* making sensor index values for sentry3/4 unique
* adding sentry3 and 4 test data files after temperature and humidity sensors update
