Fixing override-votes for gerrit trigger

You were unable to pass the correct value as yaml parses 'true' as
python True, then it will never be equal to the 'true' string.

Change-Id: If4652b27f8ae23b63dbb6e7d98f11b34ba881f49
Signed-off-by: David Caro <dcaroest@redhat.com>
Merge "Fixing override-votes for gerrit trigger"