ERROR: Failed to import the "M2Crypto" module: .../usr/lib/python2.7/site-packages/M2Crypto/__m2crypto.so: undefined symbol: SSLv2_method

disable using SSLv2_method if not supported in openssl. This is now the case
with the advent of CVE-2016-0800
Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>