Extend Hostinfo with identity and port map

[mantas-sidlauskas]

What changed?
Adding additional fields to membership.Hostinfo struct.

Why?
Currently, IP:port tuple is kept in the addr field, which is used for both: identity and addressing needs.

Added fields will be used to provide more information about peer details in a ring.
This is needed to support multi-transport RPC topologies or RPC transport to transport migrations.

How did you test it?
Unit tests

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build dc61b7f0-217f-469d-9ee5-fff8ce1d9a13

• 1 of 3 (33.33%) changed or added relevant lines in 1 file are covered.
• 86 unchanged lines in 14 files lost coverage.
• Overall coverage decreased (-0.04%) to 56.939%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
common/membership/hashring.go	1	3	33.33%

Files with Coverage Reduction	New Missed Lines	%
common/membership/hashring.go	1	76.83%
common/persistence/executionManager.go	2	76.94%
common/persistence/statsComputer.go	2	96.43%
common/task/fifoTaskScheduler.go	2	87.63%
common/task/weightedRoundRobinTaskScheduler.go	2	89.64%
service/history/execution/mutable_state_builder.go	2	69.66%
service/history/queue/transfer_queue_processor.go	2	56.86%
common/persistence/dataManagerInterfaces.go	3	58.49%
service/history/task/fetcher.go	3	86.67%
common/persistence/sql/sqlExecutionStore.go	5	62.91%

Totals
Change from base Build 37cef24f-8eb2-4aa0-b491-dccd706aa5cd:	-0.04%
Covered Lines:	82918
Relevant Lines:	145625

---

💛 - Coveralls