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Instrument test utility functions to increase fuzzer efficiency

Fuzz Introspector was reporting a high percentage of fuzz blockersin the `fuzz_diff` test. This means the fuzzing engine was unableto gain visibility into functions lower in the call stack than theblocking functions, making it less effective at producing interestinginput data.This clears a large percentage of the fuzz blockers by adding fuzzerinstrumentation to them via the `@atheris.instrument_func` decorator.

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fuzzing/fuzz-targets
- fuzz_diff.py

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`‎fuzzing/fuzz-targets/fuzz_diff.py`

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Original file line number	Diff line number	Diff line change
`@@ -17,16 +17,19 @@`
`17`	`17`	`classBytesProcessAdapter:`
`18`	`18`	`"""Allows bytes to be used as process objects returned by subprocess.Popen."""`
`19`	`19`
	`20`	`+@atheris.instrument_func`
`20`	`21`	`def__init__(self,input_string):`
`21`	`22`	`self.stdout=io.BytesIO(input_string)`
`22`	`23`	`self.stderr=io.BytesIO()`
`23`	`24`
	`25`	`+@atheris.instrument_func`
`24`	`26`	`defwait(self):`
`25`	`27`	`return0`
`26`	`28`
`27`	`29`	`poll=wait`
`28`	`30`
`29`	`31`
	`32`	`+@atheris.instrument_func`
`30`	`33`	`defTestOneInput(data):`
`31`	`34`	`fdp=atheris.FuzzedDataProvider(data)`
`32`	`35`

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Commit315a2fd

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`‎fuzzing/fuzz-targets/fuzz_diff.py`

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