add iscsi to cinder

add open-iscsi start to cinder-volume config
Merge pull request #485 from twaldrop/iscsi

add iscsi to cinder
percona garbd: work around missing init script in current garbd package version
Extract logging from common role into own role
Keep duplicate refresh CAs handlers
rsyslog: reload not restart, swift logs local file
rsyslog Remove trailing or in conditional
rsyslog use &stop statement instead of &~
rsyslog expects on/off not True/False