* Fix Sentry3 voltage sensor discovery
Previous fix broke voltage sensor discovery with superfluous .1 in the SNMP OID. I have fixed my install with this patch but other testing should probably be done.
* Update sentry3.json
Improves visual identification for sensors
- [x] Docs
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* Adding ifType to base_oids
* Improve discovery (update ifType) and polling (save ifType)
* Updated test data
* Updated json test data
* vlan isn't filtered by default :P
* With default ignored ports
* Update newer test data
* 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
