[Bug python/31467] New: gdb python api with_parameter doesn't work correctly for "breakpoint pending"

["mitch at runsafesecurity dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31467

            Bug ID: 31467
           Summary: gdb python api with_parameter doesn't work correctly
                    for "breakpoint pending"
           Product: gdb
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: mitch at runsafesecurity dot com
  Target Milestone: ---

Using `gdb.with_parameter` method with `breakpoint pending` fails and does not
restore original parameter value when original parameter is "auto".


```python
# foo.py
gdb.execute("show breakpoint pending")
print ("Old: ", gdb.parameter("breakpoint pending"))
with gdb.with_parameter("breakpoint pending", "on"):
    gdb.execute("show breakpoint pending")
    print ("New: ", gdb.parameter("breakpoint pending"))
```

```
(gdb) source foo.py
source foo.py
Debugger's behavior regarding pending breakpoints is auto.
Old:  None
Debugger's behavior regarding pending breakpoints is on.
New:  True
Traceback (most recent call last):
  File "foo.py", line 16, in <module>
    print ("New: ", gdb.parameter("breakpoint pending"))
  File "/usr/lib/python3.7/contextlib.py", line 119, in __exit__
    next(self.gen)
  File "/usr/local/share/gdb/python/gdb/__init__.py", line 263, in
with_parameter
    set_parameter(name, old_value)
  File "/usr/local/share/gdb/python/gdb/__init__.py", line 250, in
set_parameter
    execute("set " + name + " " + str(value), to_string=True)
gdb.error: "on", "off" or "auto" expected.
(gdb) source foo.py
source foo.py
Debugger's behavior regarding pending breakpoints is on.
Old:  True
Debugger's behavior regarding pending breakpoints is on.
New:  True
(gdb) 
```

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