Remove unused imports and trailing spaces
Remove unused imports and trailing spaces


Former-commit-id: 21d1acbaf7b6b3b1171ab95c0a5c07a29387817e
exonum/exonum,alekseysidorov/exonum,alekseysidorov/exonum,alekseysidorov/exonum,exonum/exonum,exonum/exonum,alekseysidorov/exonum,exonum/exonum