NMS-5582 Added useIsisDiscovery to Linkd Configuration
NMS-5582 Added IsIs boolean as config option

Added IsIs boolean to Linkd, SnmpCollectio
and DiscoveryLink to support configuration
and collection for isis discovery
NMS-5582 Added classes to walk IsIs Adj table
Documented the IsisAdjTable
Sysoid is an Octet String

Changed the methid to get isis sys id
Added class to get isissys Obj data
Added test for isis snmp walk classes
NMS-5582: added get for isisCircuit and IsisAdjCircuit

Perfectioned test for this gets
NMS-5582: added class to walk the isisCircTable

Added class and test for getting ifIndex from isisCircIndex
 NMS-5582: added isis collection to SnmpCollection

SnmpCollection now collect also IsIs protocol data
NMS-5582: storing isis collection in linkable node

The isis collection is stored
in Linkable node.
Ready to add to discoveryLink
NMS-5582: DiscoveryLink support isis llink discovery

Added the rules to DiscoveryLink to get
the link using the isis protocol data
The isisTable are now initialized

Forgot to initiale the isis snmp walk objects
Merge branch 'master' into features/linkd-isis
NMS-5582: Build Isis test

The IsIs discovery is tested for
network nms0001
Merge branch 'features/linkd-isis'