am 931fac09: keystore: fully reset user keystore on request

* commit '931fac098f2ae35aa1da26ced57962c9a21f95cf':
  keystore: fully reset user keystore on request
tree: c8047628401f1511fde644634a206d5b28ecb73d
  1. keystore/
  2. keystore-engine/
  3. softkeymaster/