Build-all bug: search for a base image in the extra_flavours directory
Build-all bug: search for a base image in the extra_flavours directory

Signed-off-by: Antonio Sagliocco <a08f08bac39aeae6c9580ade7aa8387b5a0e7428@midokura.com>

midonet/midonet-sandbox,xavileon/midonet-sandbox,midonet/midonet-sandbox,midonet/midonet-sandbox,xavileon/midonet-sandbox,xavileon/midonet-sandbox