Log Message:
The ORBit code doesn't check the number of iovec structs before it
calls writev(2).  Some of the applications which use ORBit, such as
oaf, can send 1214 iovecs, which is slightly more than IOV_MAX.  Add a
wrapper for writev(2), to check the number of iovecs passed to writev,
and loop, sending MIN(IOV_MAX, count) until the iovecs have all been
written.