gdb/breakpoint: use gdb::option for the '-force' flag

gdb/breakpoint: use gdb::option for the '-force' flag

Use the gdb::option framework for the '-force' flag of the 'condition'
command.  This gives tab-completion ability for the flag.

gdb/ChangeLog:
2020-10-27  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

	* breakpoint.c (struct condition_command_opts): New struct.
	(condition_command_option_defs): New static global.
	(make_condition_command_options_def_group): New function.
	(condition_completer): Update to consider the '-force' flag.
	(condition_command): Use gdb::option for the '-force' flag.

gdb/testsuite/ChangeLog:
2020-10-27  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

	* gdb.base/condbreak.exp: Update the completion tests to
	consider the '-force' flag.