Update local.conf template to support meta-java
Update local.conf template to support meta-java

Set preferred providers needed for the meta-java layer.  We selected
Cacao for the host platform and openjdk-7 as the runtime environment.

Signed-off-by: Adam YH Lee <aa28ee08db6737a718bd8454760cefe8d54c851d@gmail.com>

gumstix/meta-gumstix-extras,allsey87/meta-bebot-temp,allsey87/meta-bebot-temp,allsey87/meta-bebot-temp,gumstix/meta-gumstix-extras,gumstix/meta-gumstix-extras