send-email: squelch warning from Net::SMTP::SSL

Due to a recent change in the Net::SMTP::SSL module, send-email emits
the following ugly warning everytime a email is sent via SSL:

*******************************************************************
 Using the default of SSL_verify_mode of SSL_VERIFY_NONE for client
 is deprecated! Please set SSL_verify_mode to SSL_VERIFY_PEER
 together with SSL_ca_file|SSL_ca_path for verification.
 If you really don't want to verify the certificate and keep the
 connection open to Man-In-The-Middle attacks please set
 SSL_verify_mode explicitly to SSL_VERIFY_NONE in your application.
*******************************************************************

Fix this by explicitly specifying SSL_verify_mode => SSL_VERIFY_NONE in
Net::SMTP::SSL->start_SSL().

Helped-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>