scripts: rfr: support multiple recipients

Add an argument (-t, --to) to specify additional recipients for the
review email. Sometimes it's useful to highlight some people explicitly
or in addition to the usual nvgpu core list.

In the future, we might consider adding some heuristics for less typing
(such as adding @nvidia.com automatically). For now the addresses have
to be complete.

Change-Id: I0e4ce5974a7a2f3db6eacc7128b825d20d6fd57c
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1768066
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

scripts/rfr

@@ -5,7 +5,6 @@
 
 import os
 import re
-import sys
 import json
 import argparse
 import tempfile
@@ -63,6 +62,9 @@ Otherwise it's treated as a git commit ID.
                         help='Specify the email\'s subject.')
     parser.add_argument('-R', '--sender', action='store', default=None,
                         help='Specify a special from: email address.')
+    parser.add_argument('-t', '--to', action='append', default=[],
+                        help='Specify an additional To: email address. '
+                        'Can be repeated (-t a -t b).')
 
     # Positionals: the gerrit URLs.
     parser.add_argument('commits', metavar='Commit-IDs',
@@ -277,13 +279,15 @@ def email_commits(commits_info, sender, subject, args):
     else:
         msg = MIMEText(body)
 
-    msg['To'] = to_addr
+    to_addrs = [to_addr] + args.to
+
+    msg['To'] = ", ".join(to_addrs)
     msg['From'] = sender
     msg['Subject'] = subject
 
     s = smtplib.SMTP('mail.nvidia.com')
     s.sendmail(sender,
-               [to_addr],
+               to_addrs,
                msg.as_string())
     s.quit()