Miscutils: fix for send_email error on DEV site

* For the DEV site send_email function was failing while trying to
  concatenate list and string (because the CFG_SITE_ADMIN_EMAIL
  was not a list).
I'd stick with the simplest one because of the way smtplib behaves: http://hg.python.org/cpython/file/2.7/Lib/smtplib.py#l726