[PATCH - v2] Fix for insn probe: Call arch_has_*_step() prior to calling utrace_control

[Maynard Johnson]

The attached patch is version 2 for the problem I reported earlier today.

Frank, is this more what you had in mind?  With this patch, there's no need for the user to look at the system log.  Error messages are sent to stderr:

	ERROR: insn probe init: arch does not support block step mode
	ERROR: probe process("/test").function("doit1@/test.c:22").return registration error (rc -1)

-Maynard
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