INDY-733: Corrected Sovrin wallet converter (#321)
INDY-733: Corrected Sovrin wallet converter (#321)

* INDY-733: Implemented wallet migration mechanism

* INDY-733: Added a comment

* INDY-733: Corrected a test wallet file

Corrected the serialized wallet file tmp_wallet_restore_issue

* INDY-733: Updated indy-plenum-dev dependency

* INDY-733: Corrected Sovrin wallet converter

Supported the intermediate state of renaming of Link to Connection in Sovrin wallet converter to the version 1.

TechWritingWhiz/indy-node,spivachuk/sovrin-node,keenondrums/sovrin-node,TechWritingWhiz/indy-node,TechWritingWhiz/indy-node,spivachuk/sovrin-node,spivachuk/sovrin-node,spivachuk/sovrin-node,TechWritingWhiz/indy-node,keenondrums/sovrin-node,keenondrums/sovrin-node