After the random number generator seed file is read overwrite the
previous content of the file.

Jingle File Transfers work without Farstream.

ICE-UDP transport is also implemented as a part of Farstream (libnice)

Fixes #7713

Fixes #7671

fix double iq-result sending

signature algorithm for old pyOpenSSL.

Fixes #7641

The prime is: 2^4096 - 2^4032 - 1 + 2^64 * { [2^3966 pi] + 240904 }

RFC3526 specifies a generator of 2.

The generation of the group is described in RFC 2412.

Fixes: #7644