Create clear_stale_sm2t+ndmp.py

The snapmirror release command needs part of the first field and whole second field. That's what goes into the svOut.txt file. See sample output of snapmirror status below.
Next, using subprocess.Popen module, we print out out the number of stale (Idle) NDMP sessions before and after we run the os.system command to clear them.

sample of "snapmirror status":
bash$  ssh nfs126002.mail.ne1 snapmirror status
Snapmirror is off.
Source                                                   Destination                             State          Lag        Status
nfs126002-mail-ne1:vol12   nfs126002-mail-ne1:NDMP_LOCAL_000110    Source         -          Idle
nfs126002-mail-ne1:vol11   nfs126002-mail-ne1:NDMP_LOCAL_011472    Source         -          Idle