JVMDI spec: zero length list should be allowed in suspend list

The new functions in 1.4.2 JVMDI:
SuspendThreadList
ResumeThreadList

throw an error if a zero length (but otherwise well formed) list
is sent. As is, this is a source of potential unexpected error,
as lists are usually constructed programmatically. It is also
a cleaner design. The new JVMTI interface has matching functions
but is defined to allow zero length lists - they should be
consistent.

The spec for both functions should be changed from:
JVMDI_ERROR_ILLEGAL_ARGUMENT
         reqCount is less than or equal to zero (0).

to:
JVMDI_ERROR_ILLEGAL_ARGUMENT
         reqCount is less than zero (0).

The implementation for both functions should be changed from:
  if (reqCnt <= 0) {
    JVMDI_RETURN(JVMDI_ERROR_ILLEGAL_ARGUMENT);
  }

to:
  if (reqCnt < 0) {
    JVMDI_RETURN(JVMDI_ERROR_ILLEGAL_ARGUMENT);
  }
###@###.### 2002-12-19