2409 fetch stake balance from contract

[sk91]

[coveralls]

Pull Request Test Coverage Report for Build 17775

• 30 of 58 (51.72%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 43.223%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main/blockchain/contracts/contract-service.js	0	1	0.0%
src/main/blockchain/contracts/contract.js	0	1	0.0%
src/common/staking/index.js	23	33	69.7%
src/main/blockchain/staking/staking-service.js	0	16	0.0%
<!--	Total:	30	58

Totals
Change from base Build 17768:	0.01%
Covered Lines:	3458
Relevant Lines:	7356

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💛 - Coveralls