ganeti.initd: include defaults file, if present
ganeti.initd: include defaults file, if present

In the example init script we'll execute an optional defaults file to
make it easier to add local customizations to the ganeti startup.

Signed-off-by: Guido Trotter <f62ca4d5358bdaeef0e50e57f9f7e231de63727e@google.com>
Reviewed-by: Iustin <acf83a5274f31a43af6b914614365999469c1a31@google.com>

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