DH groups too short in ESessions
Bug description
The default settings for ESession uses MODP groups 5, 14 that is 1536-bit and 2048-bit DH groups (with 1536-bit prefered). According to
Yearly Report on Algorithms and Keysizes (2012), D.SPA.20 Rev. 1.0, ICT-2007-216676 ECRYPT II, 09/2012. http://www.ecrypt.eu.org/documents/D.SPA.20.pdf
this is too short for long term protection. Change it to longer DH groups.
More info at: http://www.keylength.com/
Steps to reproduce
See the default values of: esession_modp in src/common/config.py