Options for retrying a single operation.
This class is similar in function to upstream's RetryerBuilder, but it exists as its
own class in Gerrit for several reasons:
- Gerrit needs to support defaults for some of the options, such as a default timeout.
RetryerBuilder doesn't support calling the same setter multiple times, so doing
this with RetryerBuilder directly would not be easy.
- Gerrit explicitly does not want callers to have full control over all possible options,
so this class exposes a curated subset.