libqb security update

2.0.6-4 - bump rpm version for rhel-exception build Resolves: rhbz2230712 2.0.6-3 - blackbox: fix buffer overflow with long log lines Resolves: rhbz2236171 2.0.6-1 - ipc: Retry receiving credentials if the the message is short Resolves: rhbz2149647 2.0.6-1 - Rebase to 2.0.6 Resolves: rhbz2072903...