[wsrp] [change request #250] Only 1 performBlockingInteraction()?

Document: Spec

Section: 6.3.2

Page/Line: 44/28

Requested by: Michael Freedman

Old text: The Consumer MUST initiate at most one performBlockingInteraction()
for any one client request.

New text: remove this newly added line

Reasoning:  Do we really want to restrict ourselves by this for the
future?  As we haven't addressed events yet, should we be cautious
to not handtie us if we find a use case/rationale that through handling
of events would cause another blocking action to be called?  What
is the harm of NOT limiting ourselves.  As long as each adheres to
blocking rule it would seem safe.