Add ovirt-engine-4.0.6 branch to the list of stable branches

[Tal Nisan]

Otherwise gerrit-hooks ignores it: (taken from gerrit.ovirt.org/67324)

gerrit-hooks
Nov 25 19:19
↩

Patch Set 1:

   - Update Tracker::#1398550::IGNORE, not relevant for Red Hat
   classification
   - Check Bug-Url::IGNORE, not relevant for 'Red Hat' classification
   - Check Public Bug::#1398550::OK, public bug
   - Check Product::#1398550::IGNORE, not relevant for classification: Red
   Hat
   - Check TM::#1398550::IGNORE, not relevant for classification: Red Hat
   - Set POST::#1398550::IGNORE, not relevant for Red Hat classification
   - Check merged to previous::IGNORE, Not in stable branch
   (['ovirt-engine-3.6', 'ovirt-engine-4.0', 'ovirt-engine-3.6.9',
   'ovirt-engine-4.0.2', 'ovirt-engine-4.0.4'])
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