[Rpm-maint] [rpm-software-management/rpm] Throw OSEror Argument Error if method is not valid (PR #4128)

[El Malvado]

Fdopen() did not validate the IO engine specified in the mode string. Unknown engine names (e.g. "aaaiiiooo") or malformed mode suffixes (e.g. "r9xyz") would silently fall through to plain IO instead of reporting an error

Now:

```python
import rpm
f = rpm.fd('/etc/passwd', 'r', 'aaaiiiooo')
print(f.name)
f.close()


Traceback (most recent call last):
  File "<python-input-1>", line 2, in <module>
    f = rpm.fd('/etc/passwd', 'r', 'fsssso')
OSError: Invalid argument
```

Fixes #3058
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/4128

-- Commit Summary --

  * Throw OSEror Argument Error if method is not valid

-- File Changes --

    M rpmio/rpmio.cc (22)
    M tests/rpmpython.at (20)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/4128.patch
https://github.com/rpm-software-management/rpm/pull/4128.diff

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