Update DH group warnings to say that group 5 is also weak
It is advised to adhere to the recommendation of the appropriate security authority when choosing ciphers
to secure the tunnel cryptographically. www.keylength.com lists some of the standards for western Europe
and the US. It is strongly advised to use at least 2048 bit key length for MODP Diffie-Hellman groups.
DH group 5 = 1536 bits