Fix upgrade procedure in UPGRADE
Fix upgrade procedure in UPGRADE

The watcher should be disabled while upgrading.

Signed-off-by: Bernardo Dal Seno <dcdd79c5479cb9d1329ec01d126f02cb045aa103@google.com>
Reviewed-by: Guido Trotter <f62ca4d5358bdaeef0e50e57f9f7e231de63727e@google.com>

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