libct/cg/sd/v1: move path init to NewLegacyManager
libct/cg/sd/v1: move path init to NewLegacyManager

This way we
 - won't re-initialize the paths if they were provided;
 - will always have paths ready for every method.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

kolyshkin/runc,opencontainers/runc,opencontainers/runc,kolyshkin/runc,kolyshkin/runc,rhatdan/runc,kolyshkin/runc,rhatdan/runc,rhatdan/runc,opencontainers/runc,opencontainers/runc,rhatdan/runc