Dan Newton 3f31aeaa5f
CORDA-3822 Add CordaRPCOps.reattachFlowWithClientId (#6579)
Add `CordaRPCOps.reattachFlowWithClientId` to allow clients to reattach
to an existing flow by only providing a client id. This behaviour is the
same as calling `startFlowDynamicWithClientId` for an existing
`clientId`. Where it differs is `reattachFlowWithClientId` will return
`null` if there is no flow running or finished on the node with the same
client id.

Return `null` if record deleted from race-condition
2020-08-06 11:42:02 +01:00
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