vcluster-setup: Watcher, init script
vcluster-setup: Watcher, init script

- Generate a wrapper script for ganeti-watcher
- Provide command line option to specify init script

Signed-off-by: Michael Hanselmann <68b67885ff74281219b4a4be33cc20fd45078d7c@google.com>
Reviewed-by: Bernardo Dal Seno <dcdd79c5479cb9d1329ec01d126f02cb045aa103@google.com>

grnet/snf-ganeti,leshchevds/ganeti,grnet/snf-ganeti,ganeti/ganeti,ganeti/ganeti,ganeti-github-testing/ganeti-test-1,mbakke/ganeti,ganeti-github-testing/ganeti-test-1,andir/ganeti,bitemyapp/ganeti,yiannist/ganeti,onponomarev/ganeti,apyrgio/snf-ganeti,apyrgio/ganeti,bitemyapp/ganeti,leshchevds/ganeti,yiannist/ganeti,yiannist/ganeti,dimara/ganeti,ganeti/ganeti,dimara/ganeti,onponomarev/ganeti,mbakke/ganeti,leshchevds/ganeti,apyrgio/snf-ganeti,apyrgio/ganeti,andir/ganeti,mbakke/ganeti,andir/ganeti