pkcs8: replace usages of expect with fallible methods
#108
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There are several places where errors aren't expected to happen which previously used
expectto raise panics in these cases.This means that the
pkcs8crate is not panic-free in these cases. Many of them are handled more cleanly with ensured error propagation without the use ofexpect.Consumers of this crate who would like infallible APIs can call
expectthemselves in these cases.