Allow soft deletes from any state

At some point in the past, the compute manager's delete() method had
its @check_instance_state() decorator updated to allow deletes to be
performed from any combination of vm_state and task_state.  This same
change was not made to the soft_delete() method, and so soft_delete()
is only available if the task_state is clear, meaning that instances
that are put into ERROR state with task_state set to something are
effectively undeletable, if FLAGS.reclaim_instance_interval is set to
some non-zero value (which is what causes the API DELETE call to use
soft_delete() as opposed to delete()).  This patch updates the
@check_instance_state() on soft_delete() to match that on delete(),
and fixes bug 1029130 and bug 1029133.  This patch also partially
fixes bug 1029132, but more needs to be done to completely fix that
bug.

Change-Id: I78878110c696280f2bc28434433814884a526264

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