adding new test for bgp prefix-set - 321973993 (#2624)

* adding new test for bgp prefix-set - 321973993

* committing suggested changes to readme file

* committing changes

feature/bgp/policybase/otg_tests/prefix-set_test/README.md

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+# RT-1.33: BGP Policy with prefix-set matching
+
+## Summary
+
+BGP policy configuration with prefix-set matching
+
+## Testbed type
+
+*   https://github.com/openconfig/featureprofiles/blob/main/topologies/atedut_2.testbed
+
+## Procedure
+Establish eBGP sessions between:
+	•	ATE port-1 and DUT port-1
+	•	ATE port-2 and DUT port-2
+	•	Configure Route-policy under BGP neighbor/session address-family
+
+For IPv4:
+Create two prefix-sets as below:
+IPv4-prefix-set-1  - exact match on 10.23.15.0/26
+IPv4-prefix-set-2  - match on 10.23.0.0/16
+For IPv6:
+Create two prefix-sets as below:
+IPv6-prefix-set-1  - exact match on 2001:4860:f804::/48
+IPv6-prefix-set-2  - 65-128 match on ::/0
+For IPv4 and IPv6:
+	•	Configure BGP policy on DUT to allow routes based on IPv4-prefix-set-2 and reject routes based on IPv4-prefix-set-1 
+	•	Configure BGP policy on DUT to allow routes based on IPv6-prefix-set-1
+	•	and reject routes based on IPv6-prefix-set-2 
+	•	Validate that the prefixes are accepted after policy application.
+	•	DUT conditionally advertises prefixes received from ATE port-1 to ATE port-2 after policy application. Ensure that multiple routes are accepted and advertised to the neighbor on ATE port-2.
+
+## Config Parameter Coverage
+/routing-policy/defined-sets/prefix-sets/prefix-set/config/mode
+/routing-policy/defined-sets/prefix-sets/prefix-set/config/name
+/routing-policy/defined-sets/prefix-sets/prefix-set/prefixes/prefix/config/ip-prefix
+/routing-policy/defined-sets/prefix-sets/prefix-set/prefixes/prefix/config/masklength-range
+
+/routing-policy/defined-sets/prefix-sets/prefix-set/prefixes/prefix/state/ip-prefix
+/routing-policy/defined-sets/prefix-sets/prefix-set/prefixes/prefix/state/masklength-range
+/routing-policy/defined-sets/prefix-sets/prefix-set/state/mode
+/routing-policy/defined-sets/prefix-sets/prefix-set/state/name
+
+/routing-policy/policy-definitions/policy-definition/statements/statement/conditions/match-prefix-set/config/match-set-options
+/routing-policy/policy-definitions/policy-definition/statements/statement/conditions/match-prefix-set/config/prefix-set
+
+## Telemetry Parameter coverage
+N/A
+Protocol/RPC Parameter coverage
+N/A
+Minimum DUT platform requirement
+vRX

feature/bgp/policybase/otg_tests/prefix-set_test/metadata.textproto

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+# proto-file: github.com/openconfig/featureprofiles/proto/metadata.proto
+# proto-message: Metadata
+
+plan_id: "RT-1.33"
+description: "BGP Policy with prefix-set matching"
+testbed: TESTBED_DUT_ATE_2LINKS
+tags: TAGS_AGGREGATION, TAGS_TRANSIT, TAGS_DATACENTER_EDGE