Detect tables with Provisiond SNMP detector

The capsd SNMP protocol plugin can detect SNMP tables. The equivalent SNMP detector in Provisiond can only detect SNMP scalars. It should be possible to detect services based on informations from SNMP tables. The implementation of the following match types can help to give the necessary flexibility in real world applications.

match type --> result
------------------------------
EXIST --> Service detected if the table exist
ALL --> Service detected if ALL entries match an expected value
ANY --> Service detected if 1 or more entries match an expected value
NONE --> Service detected in the meaning of invert ALL

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