Simplify mi_continue_to

[Vladimir Prus]

The MI test use a helper function mi_continue_to, that is troublesome to use. First one
has to set a breakpoint, and then use mi_continue_to passing it a bunch of parameters,
where in practice most of them end up being ".*".

At the same time, we have perfectly working mi_runto that needs just function name.
This patch refactor mi_continue_to to work just like mi_runto and simplifies the tests
that use mi_continue_to. 

No regressions on x86, OK?

- Volodya

	Simplify usage of mi_continue_to.
	* lib/mi-support.exp (mi_runto_helper): Renamed
	from mi_runto, added new parameter 'run_or_continue'.
	(mi_runto): Use mi_runto_helper.
	(mi_continue_to): Accept just function name as parameter.
	Use mi_runto_helper.
	* gdb.mi/mi-var-cmd.exp: Adjust to changes.
	* gdb.mi/mi2-var-cmd.exp: Likewise.
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