[regression] libvirtd does not start due to incorrect pre-start section in upstart config

[Vladimir Kuklin]

with https://review.fuel-infra.org/#/c/21417/

the following was added into upstart conf for libvirtd:

 pre-start script 54
    LIBVIRTD_SYSCONFIG=/etc/default/libvirtd 55
    if [ -f $LIBVIRTD_SYSCONFIG ]; then 56
        . $LIBVIRTD_SYSCONFIG 57
    fi 58
    sockfile="${SOCKFILE:-/var/run/libvirt/libvirt-sock}" 59
    sockfile_check_retries=5 60
    while [ ! -S $sockfile ] ; do 61
        sleep 2 62
        if ! sockfile_check_retries=`expr $sockfile_check_retries - 1`; then 63
            echo "Giving up waiting for $sockfile." 64
            stop; exit 1 65
        fi 66
    done 67
    echo "$sockfile ready." 68
end script

This obviously will never work as pre-start happens before service start section is executed. Thus, this breaks libvirtd service and blocks ALL fuel and MOS developers in master branch.

[Fuel Devops McRobotson (fuel-devops-robot)]

Fix proposed to branch: master
Change author: Vladimir Kuklin <email address hidden>
Review: https://review.fuel-infra.org/21484

[Fuel Devops McRobotson (fuel-devops-robot)]

Reviewed: https://review.fuel-infra.org/21484
Submitter: Pkgs Jenkins <email address hidden>
Branch: master

Commit: 309a90ad96fd24593611f7747959409f17ce2337
Author: Vladimir Kuklin <email address hidden>
Date: Wed Jun 1 11:42:33 2016

Revert "Wait for socket ready in libvirtd upstart job."

This reverts commit ce1c254775ecba971186cd6b71d0fedfde0b9576 which makes libvirt never ever start.

Change-Id: I2678c12d364659a279b806c4b19ea4cf9b7f0352
Closes-bug: #1587836