add getAvailableKeys, optional validation and key permission#38

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shaqk wants to merge 2 commits intoEOSIO:developfrom

eostitan:getavailablekeys

Commits on Oct 11, 2019

add getAvailableKeys function to authenticator, make validation and permission for key optional
shaqk
committed

Commits on Oct 14, 2019

pass index in login function and update signature provider accordingly
shaqk
committed