Remove no longer needed raw Exception raises for queryRandom (#2633)

beacon_chain/networking/eth2_network.nim

@@ -879,7 +879,7 @@ proc toPeerAddr(node: Node): Result[PeerAddr, cstring] {.raises: [Defect].} =
 
 proc queryRandom*(d: Eth2DiscoveryProtocol, forkId: ENRForkID,
     attnets: BitArray[ATTESTATION_SUBNET_COUNT]):
-    Future[seq[PeerAddr]] {.async, raises:[Exception, Defect].} =
+    Future[seq[PeerAddr]] {.async, raises: [Defect].} =
   ## Perform a discovery query for a random target matching the eth2 field
   ## (forkId) and matching at least one of the attestation subnets.
   let nodes = await d.queryRandom()

tests/test_discovery.nim

@@ -3,7 +3,6 @@
 import
   unittest2,
   chronos, stew/shims/net, eth/keys, eth/p2p/discoveryv5/enr,
-  ../beacon_chain/conf,
   ../beacon_chain/spec/datatypes,
   ../beacon_chain/networking/[eth2_network, eth2_discovery],
   ./testutil