Add test for resharing wallet invitations
Add test for resharing wallet invitations

Summary:
BG-999

Signed-off-by: Tyler Levine <tyler@bitgo.com>

Reviewers: arik

Reviewed By: arik

Subscribers: ben

Differential Revision: https://phabricator.bitgo.com/D7640

BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS