Have DefaultClientRetryPolicy account for degenerately high attempt counts
#1096
| Job | Run time |
|---|---|
| 17s | |
| 49s | |
| 2m 37s | |
| 4s | |
| 2m 17s | |
| 2m 38s | |
| 11s | |
| 2m 32s | |
| 2m 35s | |
| 2m 42s | |
| 16m 42s |