a250c8eee4 Fix unused imports (Shing Him Ng)
Pull request description:
Found some unused imports while working on something unrelated
ACKs for top commit:
apoelstra:
ACK a250c8eee4 successfully ran local tests
tcharding:
ACK a250c8eee4
Tree-SHA512: ffa4fcddb91c849df7885a6d734405ab704e0353293fa3462a981e179ea49091990df4482eee2324e7b5ef250a0890b2e8983d53ec288ca6e8ada77e30c102dc