SNMP| First commit for SNMP Agent checks
SNMP| Add interface monitoring
SNMP| Fallback for interface identification in case of not indexed
SNMP| Add support for Custom tags

Also fixes bug for Counter metrics on several interfaces
SNMP| Allow use of snmp v3 authentication
SNMP| Allows to add more metrics
SNMP| Fix:Don't use device as a tag
SNMP| Takes all the metrics definition to conf.d
SNMP| Raise Exception on failed calls remove debug logging
SNMP| Allow for partial configuration
SNMP| First pass at testing

Setting up environment for Travis.ci and basic test
Merge branch 'master' into SNMP_checks

Necessary to fix travis build (Cassandra version)
SNMP| Fix test

assertGreater not available on 2.6
SNMP| Add a test performing the checks

Also fix a bug detected by a test
Cln| Remove spurious print
SNMP| Better tests for the check
SNMP| Metrics defined at the instance level
Merge branch 'master' into SNMP_checks
SNMP| Added docstring
Merge branch 'master' into SNMP_checks