zcash_client_backend: Move min_confirmations into Proposal
#2181
| Job | Run time |
|---|---|
| 7m 35s | |
| 7m 5s | |
| 4m 11s | |
| 6m 53s | |
| 5m 52s | |
| 8m 13s | |
| 16s | |
| 19m 33s | |
| 15s | |
| 21m 30s | |
| 7s | |
| 8m 41s | |
| 27m 32s | |
| 30m 13s | |
| 2h 27m 56s |