sys/kern/subr_kdb.c: 	Modify the "alternate break sequence" detecting state 	machine so that only a contiguous invocation of the 	break sequence is accepted.  The old implementation 	did not reset the state machine when detecting an 	unexpected character.
sys/kern/subr_kdb.c:
	Modify the "alternate break sequence" detecting state
	machine so that only a contiguous invocation of the
	break sequence is accepted.  The old implementation
	did not reset the state machine when detecting an
	unexpected character.

	While here, use an enum for the states of the machine
	instead of magic numbers.bmitted by:

Sponsored by:	Spectra Logic Corporation

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