adding test case for gNMI telemetry for interface ipv6 addreses, repo…

…rt SLAAC assigned link local address - Test Plan Dev (openconfig#2636)

feature/interface/ip/ipv6_slaac_link_local/README.md

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+# RT-5.9: IPv6 Link Local generated by SLAAC
+
+## Summary
+
+Enable IPv6 on interface level so ipv6 address of link-local scope is generated/assigned by SLAAC. Verify the link local IPv6 address generated, exists by checking the Openconfig path
+
+## Testbed type
+
+*   https://github.com/openconfig/featureprofiles/blob/main/topologies/dut.testbed
+
+## Procedure
+  * Configure DUT port 1 with IPv6 so that link local scope IP address is assigned by SLAAC
+  * Validate config and state paths are auto-populated
+
+## Config Parameter Coverage
+```
+/interfaces/interface/subinterfaces/subinterface/ipv6/addresses/address/config/ip
+```
+
+## Telemetry Parameter Coverage
+```
+/interfaces/interface/subinterfaces/subinterface/ipv6/addresses/address/state/ip
+```
+
+## Protocol/RPC Parameter Coverage
+None
+
+## Required DUT platform
+* FFF - fixed form factor

feature/interface/ip/ipv6_slaac_link_local/metadata.textproto

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+# proto-file: github.com/openconfig/featureprofiles/proto/metadata.proto
+# proto-message: Metadata
+
+plan_id: "RT-5.9"
+description: "IPv6 Link Local generated by SLAAC"
+testbed: TESTBED_DUT
+tags: TAGS_AGGREGATION, TAGS_TRANSIT, TAGS_DATACENTER_EDGE