add support for delay_once events

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@18063 4046b530-fbad-4e16-af16-ee11f0b55167
implement CommandHandler around PostgreSQL notify/listen functionality

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@18070 4046b530-fbad-4e16-af16-ee11f0b55167
unifying code between CommandHandler and VMCommandHandler

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@18072 4046b530-fbad-4e16-af16-ee11f0b55167
unifying code between CommandHandler and VMCommandHandler

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@18074 4046b530-fbad-4e16-af16-ee11f0b55167
unifying code between CommandHandler and VMCommandHandler

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@18075 4046b530-fbad-4e16-af16-ee11f0b55167
unifying code between CommandHandler and VMCommandHandler

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@18076 4046b530-fbad-4e16-af16-ee11f0b55167
unifying code between CommandHandler and VMCommandHandler

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@18077 4046b530-fbad-4e16-af16-ee11f0b55167
unifying code between CommandHandler and VMCommandHandler

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@18078 4046b530-fbad-4e16-af16-ee11f0b55167
implement VMCommandHandler around PostgreSQL notify/listen functionality

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@18079 4046b530-fbad-4e16-af16-ee11f0b55167
send notifications for vm start/stop commands

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@18080 4046b530-fbad-4e16-af16-ee11f0b55167