[gdb/testsuite] Add gdb.python/py-commands-breakpoint.expHEADmaster

A recent discussion about what commands are allowed during
gdb.Breakpoint.stop, made me wonder if there would be less restrictions if
we'd do those commands as part of a breakpoint command list instead.

Attribute gdb.Breakpoint.commands is a string with gdb commands, so I
tried implementing a new class PyCommandsBreakpoint, derived from
gdb.Breakpoint, that supports a py_commands method.

My original idea was to forbid setting PyCommandsBreakpoint.commands, and do:
...
    def py_commands(self):
        print("VAR: %d" % self.var)
        self.var += 1
	gdb.execute("continue")
...
but as it turns out 'gdb.execute("continue")' does not behave the same way as
continue.  I've filed PR python/32454 about this.

So the unsatisfactory solution is to first execute
PyCommandsBreakpoint.py_commands:
...
    def py_commands(self):
        print("VAR: %d" % self.var)
        self.var += 1
...
and then:
...
        self.commands = "continue"
...

I was hoping for a better outcome, but having done the work of writing this, I
suppose it has use as a test-case, perhaps also as an example of how to work
around PR python/32454.

Tested on x86_64-linux.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32454

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