Split domain management

[Anunayj]

This test should document how script addresses can be used to allow different entities to RENEW, UPDATE, and retain ownership of the domain without sharing keys.

This way watchtowers can be deployed whose sole purpose is to renew the domain, and have the ability to have a separate key for UPDATE(ing) DNS records on chain. While having a Cold Wallet (or Multisig) for the actual ownership/transfers.

HIP-0009 (handshake-org/HIPs#40) needs to be discussed to standardize how to derive the keys used for this.

This (branches from and) depends on PR #639 to be merged.

[coveralls]

Pull Request Test Coverage Report for Build 1391888710

• 24 of 25 (96.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.6%) to 62.26%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/primitives/mtx.js	11	12	91.67%
<!--	Total:	24	25

Totals
Change from base Build 1391687210:	0.6%
Covered Lines:	21187
Relevant Lines:	31813

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💛 - Coveralls