HYD-514 Exit with error if AgentStore is missing.
HYD-514 Exit with error if AgentStore is missing.

If AgentStore.get_target_info() fails to find the store for the given
uuid, exit with 1 so that the caller doesn't think the target is
mounted.  Afterall, how can it be if the store isn't even there for it?

intel-hpdd/intel-manager-for-lustre,intel-hpdd/intel-manager-for-lustre,intel-hpdd/intel-manager-for-lustre